Not counting the Steam Deck, since KDE isn’t actually turned on while you’re running games.
Normally I’m a Gnome guy, but I’m building a tiny low power portable computer and wanting to keep resource utilization low, so I’m investigating other options.
I keep going back and forth between KDE and Gnome. KDE is great on my desktop where I always have a mouse plugged in, but on my laptop I really like the workflow and gestures that Gnome on Wayland has.