Yesterday, I worked with both TrueNAS and UnRAID, and I find myself more inclined towards TrueNAS, primarily due to its ability to install the operating system directly on an NVMe drive in RAID1 (huge plus for this!). In contrast, UnRAID relies on a USB device for booting, which—regardless of brand—has proven to be unreliable in my experience. That said, it’s worth noting that QNAP’s OS also boots from USB, so in that regard, it’s a fair comparison.
At present, I’ve reverted to using QNAP’s operating system. The main reason is that neither TrueNAS nor UnRAID offers native support for the OVA virtual machine format. Since this NAS functions as my primary system for virtualization, switching platforms would require extensive downtime due to the need for image conversion.
I do, however, plan to acquire a smaller QNAP NAS for off-site backups. This setup will allow me to thoroughly test the virtualization capabilities of both TrueNAS and UnRAID in a non-critical environment.