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.
Tried XFCE, KDE and GNOME but settled on GNOME.
XFCE struggled with window management especially when gaming. KDE is too messy and inconsistent. GNOME is just easy, and my wife can use it without asking questions.