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X, because honestly my screen works and don't currently need to replace the server behind it.
I understand and X works fine for a lot od people but do remember the number of developers maintaining it have been dropping year on year. No harm in trying IMO. If you are on Plasma or Gnome, you get a simple switcher on the login screen.
Yeah, I know X is really showing its age.
I have to add that the switcher is not on Debian 12 by default, where Wayland support for Plasma is optional in plasma-workspace-wayland. Also, it is broken on Nvidia due to missing packages/libraries and Nvidia's proprietary driver still in general not supporting Wayland properly.
It is bottom left on my sddm login Wayland or X11 session kde. Debian 12 bookworm AMD
Because you installed it, or because 12 now gives both via tasksel (or Debian setup). My system is from Debian 10