Debian is LTS in your traditional sense, so it doesn’t have the full Mutter feature set that current GNOME has. So X11 is probably your best bet if you’re running Debian 12.
Also, judging by this article article Wayland is on by default.
A way to check this is to find the About pane on the GNOME Settings window to see if it’s running under X11 or Wayland.