Debian, Ubuntu and Fedora should be good (in that order); I'm not very aware on truenas to give an opinion, but it seems it will work just as well from other comments.
I personally use Fedora, and it's been a solid experience too, with the only gripe bring SELinux. I required a fix for SELinux, but it has worked flawlessly since.
However SELinux might make it annoying to work with containers, so you could consider either switching it off, using another distro or using appropriate configurations to work with it correctly.
No reason other than the fact that you need extra steps to get Jellyfin working in Fedora.
If you have the patience and time, as I mentioned, you can still use Jellyfin in Fedora.