Interesting results, in a nutshell it seems like Wayland/Xwayland performance on both nVidia and AMD wins slightly more than it loses. Once VRR is live in nVidia 545 series driver, for 3D games, Wayland is looking to deliver a great experience. Performance when Wine’s Wayland code is ready to mainline will be very interesting given that Xwayland needs will be negated at that point.
Wayland on GNOME (on Nobara 37) worked well enough for my use that I completely forgot it was using Wayland.
For KDE (on openSUSE Tumbleweed), that I’m currently using, I had to go back to Xorg but I have high hopes for Plasma 6.