There are so many groups in Linux. Ubuntu was oriented towards Windows users. Check out Arch Linux pkgstats [1]:

* gnome-shell is GNOME

* plasma-workspace is KDE

* i3-wm and sway — tiling WM and its Wayland successor

* xmonad — WM building framework

Note: these are installed packages among those who opted in, does not strictly reflects usage. Some fun statistics [2].

[1] https://pkgstats.archlinux.de/compare/packages#packages=gnom...

[2] https://pkgstats.archlinux.de/fun