Fedora, although I dislike SELinux and I think they should have a less strict policy with regards to FLOSS. Like, I prefer FLOSS over proprietary software, but I just wish they’d be a bit more pragmatic and allow both on the default repos and just leave it up to the user to decide what to use and what not. I guess that would also prevent dilemmas like the recent hardware acceleration drama?
Otherwise I like their balance between stability and being up to date, fast update cycle and the large amount of available packages.