Be aware that Debian's xwayland depends on x11-common, so your number here will be the combined total of Xorg and Wayland.
You could try comparing xserver-xorg-core instead, but even then that'll only show you the number of submitters who have it installed, not the number that actually use it. The usual way to get a graphical desktop in Debian (task-desktop) pulls in both Wayland and Xorg, but uses the former by default.
The best estimate would be something like the number of xserver-xorg-core installs less the number of xwayland installs.
Using that method, it looks like there are roughly twice as many GNOME users as pure Xorg users.
You could try comparing xserver-xorg-core instead, but even then that'll only show you the number of submitters who have it installed, not the number that actually use it. The usual way to get a graphical desktop in Debian (task-desktop) pulls in both Wayland and Xorg, but uses the former by default.
The best estimate would be something like the number of xserver-xorg-core installs less the number of xwayland installs.
Using that method, it looks like there are roughly twice as many GNOME users as pure Xorg users.