Even though Ubuntu is beginner-friendly at first sight, in very short time you'll see that all the benefit you're supposed to get from a community are actually hacks to solve things like: GUI issues with Unity, some services not starting, services crashing randomly, and so on.

Fedora is often taken as somewhat unstable because of its fast release cycle and lack of a long-term support release, but, in my experience, it has proven itself to be very reliable and stable for my workflow.