Hasn’t Suse been KDE by default since… as long as I can remember? Debian defaults to GNOME but it lets you pick the DE in the installer IIRC (haven’t installed Debian in a long time since I just use it for servers). Last I heard, Fedora is making KDE an official supported DE. You’re also leaving out other popular user-centric distros like Mint which don’t use either DE (toolkit it GTK but the UX paradigms makes it so just about any toolkit means that it’ll look & feel right on Cinnamon).
