I also had a pretty terrible experience with Fedora KDE not too long ago. Too many issues to count. In the end, I couldn’t start a Plasma session from the display manager anymore so I gave up.
I really wanted to like Fedora, but…well, Fedora does not seem to like me. My experience on Arch KDE has been great. Like night and day. Still a few small bugs, but annoyances and not showstoppers. My experience with GNOME on Arch has been fantastic. Only one program was broken in GNOME that isn’t in KDE. It makes me wonder why I ever tried to leave…