I'm gonna have to say George. He composed some my favorite Beatle songs, "Within You Without You", "Blue Jay Way", and "Taxman". I love how spiritual and down to earth he was(although all four of em are). His solo stuff is also my favorite solo music to come from the Beatles.
I love all of them, during the Beatles era, but after the band broke up, Paul wins for me. He's always seemed like the nicest, most down to earth person out of all of them.