Part of me is starting to wonder, honestly. I will say that the web UI for TrueNAS Scale is leagues better than Unraid's, which to me always felt confusing and hacked together. ZFS is also really nice, although Unraid did recently add support.

One pain point I've run into with TNS is that access to Docker or Kubernetes seems to be intentionally locked down from access anywhere but the built in apps catalog. As someone who works with Docker and various orchestration engines professionally, I much prefer being able to define and stand up my own services to using a list of predefined templates. There are obviously ways of getting around the restrictions in TNS, but with Unraid, I could install something like Portainer or simply drop into the terminal and run docker commands myself. Not having that is frustrating.

Overall though, I think TrueNAS is a much cleaner and more modern user experience, so long as you stay on their rails. Which I suppose is the point.