It's not like I could really tell which Linux distro is the best, since I only tried Ubuntu, yet, but I think it's a pretty easy one, as long as you don't try to fiddle to much in the advanced settings without exactly knowing what you do. I had it for a month now on my Notebook and it became pretty much useless.
It also has this very handy application wizard, that lets you download packages and install them without having to work through lines of code in the console
So I'd recommened you Ubuntu/Kubuntu although I can't say if any other distro might be better.