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.
It just seemed to me like the most familiar looking at the preview screenshots on the download page. This and the fact that cinnamon is the most supported by Mint out of the 3.