KDE, but only with an extension called kröhnkite for auto tiling. To me a manual stacked window management system is almost unusable. As someone who used tiling window managers for years and lots of KDE based applications, and as KDE was one of the first who worked well in Wayland, I thought to give it a shot. I like it and since then (years by now) stayed on KDE.
For reference, I used Gnome 2 on Ubuntu, made the switch to Unity desktop, then Gnome 3 (and I think Gnome 4 too?, don't remember). Then started experimenting with Regolith, auto tiling for Gnome, and tried out real tiling window managers, until I landed on qtile. Then experimented with Xfce, before finally making the switch to KDE (because of Wayland). Rest is history.