Fedora. I've used Arch, Ubuntu, Debian, and OpenSUSE. Except Arch (curiously), none of them came even close in usability and stability. Since Arch requires too much tinkering around and I wanted something that "just works" out of the box, I tried out Fedora, and haven't looked back.

And with "just works" I also mean the little things. Ubuntu also "just works", but in 17.10 for example they didn't ship the gnome indexer that allows you to search for files in the overview , so I had to manually install it. It's stuff like that which ruins a Distro for me. With Fedora, I never had such an experience.