The very same ones when one compares Fedora Workstation to Fedora Silverblue. Which mostly come down to Bazzite offering more stability, improved security, reproducibility, atomic updates and a pinch of declarativity^[1]^ at the expense of relearning a thing or two and actually being limited in some (rather niche) actions that are currently not supported on Silverblue (and thus -by extension- Bazzite). Chances are rather slim that the average Nobara-user would delve into any of those unsupported actions. So if you ever happen to stumble upon something you're not able to do/perfom on Silverblue/Bazzite/uBlue then it's safe to assume that you're not approaching it correctly and that a different approach would have resulted in the desired outcome.

1. Regular Silverblue is not very declarative, if at all. However, the toolkit that uBlue offers -and which is used by Bazzite to create its image- enables one to have some degree of declarativity. It's by no means comparable to the likes of NixOS or Guix, but it's only going to get better from here.

Ublue is immutable like steamos