THE linux distro. The absolute best one there is. It's actually not as hard to install as you might think. They have an awesome installation guide, follow it exactly, and you're as good as gold, furthermore you compile your own kernel, if done right, all your hardware is supported 100%. If your software isn't listed in the gentoo repo, install layman to get unsupported packages. One of the best things about gentoo, is that your software is ALWAYS up to date, you compile the very latest version yourself, you will never be behind the times. Also due to the awesomeness of USE flags, you can compile your software JUST the way YOU want it to compile. There is no limit to what you can do, if you use gentoo!
Gentoo, THE linux distro.