KDE has been a treat for me after having used Gnome so long, I like both and in fact I still keep Gnome on the laptop, especially for the smooth gestures.
On the desktop I’m keeping KDE as it feels more suited by default, for that I suggest Fedora Kinoite because I honestly can’t ever imagine running a mutable system anymore, unless it is strictly for tinkering and, since it seems you’re looking for something that has to just work, that will be a great fit!
::: ..Now to talk about what hasn't just worked for meI used to experience freezes and crashes, but don’t see them happening anymore (maybe it was my hardware being too new?); containers (mostly distrobox), I don’t know what the heck is happening behind the scenes, but I think I’ve seen my containers breaking for the third or fourth time across updates this year, luckily it’s not a tragedy as you can usually roll back the system temporarily (OSTree rocks!) and/or remake them from snapshots or apply fixes that are mentioned in the issue trackers and whatnot when they pop up, the podman devs and others folks are fast and responsive.
All in all, these being the biggest issues for me, this distro is one of the most rock solid there are!