Note the difference between Fedora and Fedora Silverblue. Fedora is a regular Linux distro, like Ubuntu. Silverblue is an immutable distro which uses rpm-ostree and provides atomic updates. Universal Blue is based on Fedora Silverblue whereas Nobara is based on normal Fedora. Bazzite is a more gaming-focused variant of Universal Blue. I prefer Silverblue and Silverblue-based distros, because they are more stable and reliable. Bazzite perfects this experience and adds some more stuff on top, to making everything easier and more pleasant.