Ubuntu default's session is Xorg, but wayland is supported also.

I didn't want to "hack" around the distro, that is, leave GDM running, change TTY and login+xinit. If I'm stuck with a distro, I might just as well use that to my advantage and learn how to use it.

Just as a note, I'm now fully up and running on my very own session. I got everything setup just as I want, and it was much easier than I initially though. I'll make a separate post to expose my solution !