yesterday I upgrade F35 to F37, I found F37 default Xorg not Wayland, after some investigation,I comment two line in file /usr/lib/udev/rules.d/61-gdm.rules:
then use dracut to rebuild boot img, finally the default gnome option in gdm will lead to wayland choice, I wonder why wayland still not default in F37, maybe someone encounter possible problem when use wayland, but wayland works well in my laptop without big barriers.
xorg-x11-xserver package in fedora office repository is very out of date, still version 1.20.14 but latest version already 21.1.7. will fedora plan to upgrade the version of xorg to the newest, I wonder why not pack the newest ?
On a fresh install, Wayland is the default. However, you upgrade an Xorg configuration. Apparently, the upgrade leaves that configuration intact. You are free to log in to a Wayland session and continue using that if it goes well.
Note also that for some specific graphics cards, Xorg remains the default. Could be the case for your Nvidia.
Note the versions for xorg-x11-server are not coinciding between the Xorg and Xwayland packages. They are not required to match since they support different DE environments.
As noted, when a user chooses to log in using xorg that choice remains in effect until the user selects to switch the DE with another log in. The user selects the DE when they log in (or by default allows it to remain as previously selected).