I tend to prefer gnome's simplicity and its desktop metaphor, though I'm a niri guy now. But KDE is excellent. It's fast, pretty, customizable, and enjoyable to use. My gripe with it is that the sheer number of options and their constant presence in the UI does not play nicely with my gently spectrum brain. It's not even that I can't resist the urge to fiddle--I can, no problem--but that the presence of all the options causes anxiety. (There are also a few, to my eye, inelegant spacing quirks, but nothing I can't ignore.)

Having said that, it's a marginal difference. KDE is on my kid's computer and I use that from time to time without imploding in a ball of emotional-intellectual panic.

I have to say "the computer UI you can use without imploding in a ball of emotional-intellectual panic" is probably the best front of the box quote I've run across in a while ;-)