xUbuntu.
lUbuntu.
Honestly. Fuck Unity and Gnome.
Until they don't – I supported Linux desktop users for years and, even ignoring fun with the occasional kernel/driver update rendering systems unbootable or breaking sound/video, every so often I had to troubleshoot something which turned out to be caused by a backwards-incompatible change. It turns out that Linux developers are just like developers for every other platform and make mistakes or intentional changes for things they no longer wish to support.
> This is far, far more friendly than what OSX forces you to go through after each and every update.
My experience with every release since 10.0.0: install, reboot, go back to work. The thing to remember for every platform is that you hear about complaints from the small percentage of people who encounter something unusual because relatively few people spend months camped out on forums to remind everyone that an update didn't break anything.
The thing about Linux is that once you've tinkered, things stay the way you are.
Copy over your home folder to your next distro and just about everything goes back to the way it was. When I wiped xUbuntu 14.04 and installed the 15.04 alpha, I didn't have to do anything to get XFCE back the way I wanted after I copied the contents of my home folder over and gave it a reboot.
This is far, far more friendly than what OSX forces you to go through after each and every update.