For me, its Ubuntu, despite the moral tendencies of its facilitators.
I used Ubuntu for years, but just recently installed Debian with Gnome. Definitely not as beginner friendly as Ubuntu, but I’m happy with it so far.
That would be Fedora.
I love fedora because it just works. Everytime I use something I always end up reverting because it’s just so much sturdier than other sister for me. I want to love Ubuntu, I really do! But for me I always find cracks where I break apt or I need multiple version of pythons… and while I can fix and do those things on Ubuntu, they just work on fedora: multiple python versions, dnf history undo…
What is wrong with this Ubuntu spelling on this laptop logo?
Fedora because most devs provide an rpm file to conveniently install, and fedora is very stable even though the package versions are newer than ubuntu, which is also another reason I like fedora.
But I don’t use Gnome anymore because I moved to tiling WMs on Arch.