The short answer: use Unraid if storage flexibility matters most, TrueNAS Scale if data integrity matters most, and Proxmox if running virtual machines is your primary goal. All three are mature, actively developed platforms with large communities. The choice between them is not about quality. It is about which platform is optimised for what you actually want to do. Running any of them for a use case it was not designed for is possible but creates unnecessary friction.
In short: Unraid ($59-129 USD one-time) is best for mixed-drive NAS storage plus Docker containers. TrueNAS Scale (free) is best for ZFS data integrity with uniform drive pools. Proxmox (free) is best for virtual machine and LXC container management. All three can run Docker and VMs, but each has a different primary strength.
Side-by-Side Comparison
Unraid vs TrueNAS Scale vs Proxmox VE
| Unraid | TrueNAS Scale | Proxmox VE | |
|---|---|---|---|
| Cost | $59-129 USD one-time | Free (open source) | Free (open source) |
| Primary strength | Flexible NAS storage | ZFS data integrity | VM and container management |
| Storage model | Parity array; mixed drive sizes | ZFS pools; matched drives per vdev | ZFS or LVM; flexible configuration |
| Drive mixing | Yes, any size in same array | No; vdev drives should match | Yes but no built-in parity protection |
| Data integrity (bit rot) | No per-block checksums on data | ZFS checksums on all data | ZFS checksums (if using ZFS datasets |
| Docker support | Community Applications plugin | TrueNAS Apps (Helm-based) | LXC containers; Docker inside VM |
| VM support | KVM/QEMU built-in | KVM/QEMU built-in | KVM/QEMU; primary use case |
| NAS shares | SMB, NFS, AFP built-in | SMB, NFS, iSCSI built-in | Manual configuration required |
| Base OS | Custom Linux (Slackware) | Debian Linux | Debian Linux |
| Learning curve | Moderate | Moderate to steep | Moderate to steep |
| Best use case | Home NAS plus containers | Archive and data integrity | Hypervisor with NAS storage |
Unraid
Unraid is a paid Linux-based NAS and homelab OS developed by Lime Technology. Its core innovation is the parity array model: data drives operate independently, and one or two parity drives protect against failure. Unlike RAID or ZFS, you can add a 4TB drive next to an 8TB drive and use all available space. No rebuilding, no rethinking. This incremental growth model is why Unraid dominates homelab builds where people source drives over time rather than buying a matched set upfront.
The Docker container experience in Unraid is the best available on any NAS platform. The Community Applications (CA) plugin provides a searchable template library with pre-configured settings for Plex, Jellyfin, Home Assistant, Nextcloud, Vaultwarden, and hundreds of other services. Non-technical users can have containers running within minutes. Unraid also supports VMs via KVM/QEMU with GPU passthrough, making it a capable single-box homelab solution for a wide range of workloads.
The main weaknesses are the licence cost (no free alternative within the platform), no per-block checksum protection against bit rot on data drives, and relatively slow rebuild performance after a drive failure compared to ZFS or hardware RAID.
Pros
- Mix any drive sizes in the same array without capacity waste
- Best Docker container management experience on any NAS platform
- Runs on any x86-64 hardware including cheap second-hand servers
- Drive spin-down saves power and reduces noise overnight
- One-time purchase with no subscription renewals
- Strong community and active plugin ecosystem at forums.unraid.net
Cons
- Paid licence ($59-129 USD) where TrueNAS and Proxmox are free
- No ZFS; no automatic per-block data integrity checking
- Slower array rebuild after drive failure than ZFS resilver
- Licence tied to a physical USB boot drive
- No official mobile app suite
TrueNAS Scale
TrueNAS Scale (now simply called TrueNAS) is the Debian Linux-based successor to TrueNAS Core (FreeBSD). Developed by iXsystems, it is free and open source with no feature limits or drive count restrictions. It uses ZFS as its storage foundation, which provides the strongest data integrity guarantees of any home NAS platform: checksums on every block of data, automatic scrubbing, silent corruption detection and repair, and snapshots with minimal overhead.
ZFS is the main reason to choose TrueNAS over Unraid. For long-term archive storage, photographs, video projects, or any data where undetected corruption would be catastrophic, ZFS's checksum model is the correct choice. Unraid's parity system protects against drive failure but will not tell you if a file has silently corrupted on a drive that is still working. ZFS will, and it will fix it automatically if you have redundancy configured.
TrueNAS Scale 24.10 and later versions use a Helm-based app deployment system called TrueNAS Apps. It is functional but less user-friendly than Unraid's Community Applications plugin. Users who are comfortable with basic Helm configuration or the TrueNAS chart system will find it workable. Users who expect a one-click Docker experience comparable to Unraid's CA plugin will find it more complex.
Pros
- Completely free with no drive count limits or paywalled features
- ZFS provides the strongest bit rot and data integrity protection available
- Native SMB, NFS, and iSCSI support without plugin installation
- Snapshots and replication built-in for robust local and offsite backup
- Debian Linux base; standard apt package management for advanced users
- ECC RAM is strongly recommended and works correctly with ZFS memory management
Cons
- ZFS requires uniform drive sizes within a vdev for efficient capacity use
- Adding drives to an existing pool requires adding a new vdev, not a single drive
- TrueNAS Apps (Helm-based) is less user-friendly than Unraid's CA plugin
- ZFS memory usage is significant; 1GB RAM per TB of storage is a common guideline
- No drive spin-down equivalent to Unraid's power management
- Interface has improved but remains more complex than Unraid for initial setup
Proxmox VE
Proxmox Virtual Environment (Proxmox VE) is a free, open source hypervisor built on Debian Linux. It is not a NAS operating system. It does not include built-in NAS features like SMB shares, SMART monitoring dashboards, or drive health alerting out of the box. What it provides is exceptional virtual machine and LXC container management with a mature web interface, enterprise-grade HA clustering support, and a flexible storage backend system that integrates ZFS, Ceph, NFS, and iSCSI.
The typical Proxmox homelab strategy involves running TrueNAS Scale virtualised inside Proxmox with direct disk passthrough to the TrueNAS VM, then consuming that storage from other VMs via NFS or SMB. This approach works well but means you are managing two operating systems and accepting the RAM overhead of both. An alternative is running ZFS datasets directly on Proxmox and exposing them over NFS to other VMs, avoiding the virtualisation overhead of TrueNAS.
Proxmox is the right choice when your primary workload is running many virtual machines or LXC containers and NAS storage is a secondary concern. Running Proxmox when you primarily need a NAS adds unnecessary complexity. Running Unraid or TrueNAS when you primarily need to run many VMs misses Proxmox's strength as a dedicated hypervisor.
Pros
- Free with no feature limits; enterprise features including HA clustering available at no cost
- Best VM and LXC container management of any home hypervisor platform
- Supports ZFS natively; can run ZFS datasets directly without a separate NAS OS
- Flexible storage backends: ZFS, LVM, Ceph, NFS, iSCSI all supported
- Proxmox Backup Server (separate download) provides efficient VM backup with deduplication
- Widely documented; enormous community and enterprise knowledge base
Cons
- Not a NAS OS; SMB shares, SMART monitoring, and drive health alerts require manual setup or a NAS VM
- Complexity increases when running both Proxmox and TrueNAS; two OSes to manage and update
- No equivalent to Unraid's Community Applications for one-click container deployment
- ZFS memory requirements apply to Proxmox datasets just as to TrueNAS
- Steeper initial learning curve than Unraid for users new to virtualisation concepts
- No drive spin-down or power management equivalent to Unraid's home-focused features
Which Should You Choose?
Choose Unraid if: Your primary goal is a home NAS where you add drives over time in different sizes. You want to run Docker containers for services like Plex, Home Assistant, or Jellyfin alongside your storage. You value a polished GUI that handles most configuration without touching a command line. You are comfortable paying the one-time licence cost in exchange for a better user experience than the free alternatives provide for this specific use case.
Choose TrueNAS Scale if: Long-term data integrity is your primary concern and you want ZFS checksums on everything. You are building a uniform drive pool with matched drive sizes and do not need to mix and match. You want a completely free solution with no licence cost. You are comfortable with ZFS concepts or willing to learn them.
Choose Proxmox if: Your primary goal is running multiple virtual machines and containers, with NAS storage as a secondary function. You want enterprise-grade VM management features at home. You plan to run many different services isolated in separate VMs or LXC containers. You are comfortable managing multiple operating systems and want maximum flexibility at the hypervisor level.
Common hybrid approach: Some homelab builders run Proxmox as the hypervisor and TrueNAS Scale as a VM with disk passthrough, getting the best VM management alongside ZFS data integrity. This adds complexity but is a valid architecture if you need both capabilities. Unraid handles the same use case in a single OS with less complexity, at the cost of no ZFS checksum protection.
Related reading: our NAS buyer's guide, our Synology vs QNAP comparison, and our NAS RAID guide.
Free tools: RAID Calculator and NAS Sizing Wizard. No signup required.
Free tools: RAID Rebuild Time Estimator and ZFS vDev Calculator. No signup required.
Related reading: our NAS explainer.
Can I run TrueNAS Scale inside Proxmox?
Yes, this is a common and well-documented setup. Pass physical drives directly to the TrueNAS VM using PCIe passthrough of the HBA (host bus adapter) or individual disk passthrough. Do not present drives to TrueNAS through Proxmox's virtual disk layer, as this undermines ZFS's ability to interact directly with the drive firmware. With correct disk passthrough, TrueNAS running inside Proxmox behaves identically to TrueNAS on bare metal.
Is Unraid's parity protection as good as ZFS RAIDZ?
They protect against different failure modes. Unraid parity protects against complete drive failure (one drive with single parity, two with dual parity). ZFS RAIDZ also protects against drive failure but additionally provides per-block checksums that detect and correct silent data corruption on drives that are still working. Unraid cannot detect bit rot on data drives. For archival storage or any data where silent corruption would be serious, ZFS is the stronger choice.
Does TrueNAS Scale require ECC RAM?
ECC RAM is strongly recommended but not required. iXsystems recommends ECC RAM for TrueNAS builds because ZFS relies on RAM integrity for its write operations. Non-ECC RAM corruption can lead to corrupted data being written to the pool in rare circumstances. For home use with reliable non-ECC RAM and regular ZFS scrubs, many builders run TrueNAS successfully. If you have ECC RAM available or are building specifically for data integrity, use it.
Which platform has the best Plex server experience?
All three run Plex reliably. The key variable is hardware transcoding. Unraid's Community Applications plugin makes Plex installation straightforward, and Intel Quick Sync hardware transcoding works via GPU passthrough or direct installation. TrueNAS Scale runs Plex via the app system. Proxmox typically runs Plex in an LXC container or VM. For a dedicated Plex server, an Unraid build on Intel Core hardware with Quick Sync enabled is the most common and well-documented configuration.
Can I switch from Unraid to TrueNAS or Proxmox without losing data?
Switching requires migration rather than an in-place conversion. The storage formats are incompatible: Unraid's parity array, TrueNAS's ZFS pools, and Proxmox's storage backends are fundamentally different. The migration path is: back up all data to an external drive or cloud storage, install the new OS, configure the new storage pool, restore data. This is why choosing the right platform upfront matters. Plan your switch carefully and verify backups before reformatting.
Still deciding? The interactive Homelab OS Selector asks five questions and recommends the right platform for your specific build.
Open Homelab OS Selector →