But I too have shyed away from fedora the last few years.
I'm primarily a KDE user but I guess now is a good time to try fedora again if I get some time. (On my test vm now: latest Ubuntu with gnome. Also hoping to give solus/budgie a little more time.)
For the record Fedora Gnome was rock stable on the same machine. The only reason I didn't keep it is that I need what I call a 'pinnable taskbar' (like Windows 7).
If you really want KDE you could try KDE Neon, still a bit buggy for my taste but at least it's usable.
After a few more distros I settled on Mint Cinnamon. Not bad but frankly I miss Windows.
I no longer use them though (to get more screen space)
For me, I ran into a regression with compositing: https://bugs.kde.org/show_bug.cgi?id=354146
After I disabled the desktop effects Fedora 25 was rock solid.
I haven't upgraded to F26, I normally wait a week or two to shake out any big issues.
I'm currently on KDE Neon at home and at work until I switched jobs a couple of months ago and I also liked Mint Cinnamon a lot.
I was surprised how good Fedora is these days. The GNOME desktop is buttery smooth with Wayland and the Nouveau drivers on the relatively old Quadro that the machine has. Audio and suspend/resume worked out-of-the-box without any problems. Upgrades are very fast thanks to DNF and delta RPMs. Software also seems to get minor release updates within a release (e.g., I had some vim updates).
The Fedora installer also put / on a separate btrfs subvolume as it should (Ubuntu didn't do that in 16.04, not sure if they fixed that).
Great work Fedora folks!