What DEs are common/supported on Fedora, I use KDE (Kubuntu), I'm not keen on snaps and so it seems expedient to switch distros when I next install (as it seems Ubuntu are all in for snaps).
Well, this is a KDE variant of Fedora Silverblue, so there are some quirks. If you want normal Fedora but with KDE, there is a KDE spin available: https://spins.fedoraproject.org/kde/
Whoops! Nice catch, I love Silverblue but forgot this was the Silverblue KDE spin.
Gnome is the default and there's a KDE "spin", but I use Sway myself so I can't really comment on how well KDE works.