Join Date:Joined: Jul 2007
Ubuntu 9.10 for me. Been running it since 8.04
Its going to be hard to beat Ubuntu simply because of the support that can be found for it. Being the most popular, it has the largest community and chances are any problem your having will have already been encountered.
That is not to say its the absolute best, but it sure is nice! If you like a little more eye candy, try Kubuntu or Mint