Just installed KDE Plasma on my Ubuntu system to replace GNOME and Wayland. Mainly to get rid of an issue where my games would lose mouse lock, but now I can have two different wallpapers on both monitors and have a clock on my second monitor which is AWESOME.
I WISH I INSTALLED IT SOONER, I LOVE IT.
To clarify: KDE Plasma has both an X11 and Wayland session, on the Wayland session X11 apps run using the provided Xwayland server.
The difference is that there are some restrictions for X11 apps, like on many distros X11 apps can’t detect all keypresses when not focused or steal mouse focus.