I switched from WIndows to Ubuntu years ago after evaluating many distro communities and distro directions. At the time, Ubuntu appeared to have a good vision, and good balance between "it just works" (my computer is vital to my professional life and MUST work with minimal effort) and "power users will be at home" (my first jobs were on UNIX systems decades ago, this was very important to me).
From a technical perspective, Ubuntu was just a little ways ahead of others, IMHO.
From a community perspective, it was miles ahead! Fewer trolls, easy to participate, easy to grow, good tools and sites for the community. Most other distro sites and fora were, well, slapdash, poorly conceived, for the cognocenti, and full of the usual Linux aggressive bullshit ("well, just do cmd-alt-bang-fork-shift-nano-vim, you stupid goof, it's obvious!").
That made the switch easy, and I recommended Ubuntu many times and used it for years.
Then Shuttleworth slowly became less benevolent, community tools became harder to use, information that had been easily available began to disappear, and the distro itself became muddled. There was just no way to be a comfortable power user anymore, at least not without major effort.
And if I'm going to spend major effort, why use a system I don't like? So I started switching.
I tried Mint, I tried pure Debian, I made mistakes and learned a lot. Great. But.
I enjoy being able to configure as desired and be a power user occasionally, but I don't want to have to be one all the frikkin' time. And Mint and Debian required way too much hand-holding. Eventually, because too many things didn't just work, I went back to Ubuntu. But it was nasty and ugly and difficult to use and didn't support my 4 year old laptop as well as it used to and just wasn't fun.
I caved. I bought a Mac a few weeks ago, a 13" Air. Wow. What a beast! It's fun to use, easy to use, I can get work done without pain. LibreOffice on this thing screams!
Sure, I don't power use much anymore, but you know what? That fun is gone. Life is too short to spend so much time tweaking config files, and too short to use ugly, obtuse, opaque systems like Unity. I never thought I'd ever say this, but I love OSX.
All the philosophical and principled reasons for using Linux have largely been abandoned by Ubuntu, other distros are way behind, and if I'm going to use a commercial OS - which Ubuntu clearly wants to be - I might as well use a nice one that works well on insane kick-ass hardware. I'll be on OSX on this Air for years. Goodbye Ubuntu.