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.
KDE currently. Modern GNOME drives me somewhat insane - too “streamlined”. I used WindowMaker for a long time and somewhat miss it, but I’ve had problems with compatibility with some software (Steam).