Arch because I like simple.
Other distros are an exercise in patience I think. Each Ubuntu version has different names and versions of stuff like docker, mysql and everything else. It's really annoying to work with. I assume all six month distros are like that. And you have to add extra repos, keys and whatnot for it to even find things.
With arch, since it's rolling, I just install the latest version and I already know the command. It's always the same. Always.
There are many reasons I like arch but the simplicity of the installations is one of my favorite reasons to use it, and the fact that it's always the latest version.