Fedora with GNOME.
I’ve been using it for over than 10 years in my main computer.
It simply works, it’s nice, fresh packages, stable, GNOME is productivity champion (at least I know all the shortcuts, and how to tweak it to my daily use). I also know how to build and manipulate RPM packages, so it’s pretty convenient.
Mostly for fun/learning and to tweak some Fedora packages to my needs. I keep my own RPM repository.