Ten? I can't even narrow it down to fifty: a few years ago I tried making a compilation of my favorite Beatles tracks for my car and ended up burning the whole EMI catalog in chronological order on about eight CDs with yet another disc of studio outtakes. I didn't even try to sort out demos or live cuts. I really am disgracefully lame.
Favorite John song: "Rain"
Favorite Paul song: "Blackbird"
Favorite George song: "Here Comes The Sun"
Favorite Ringo vocal: "Good Night"
All subject to frequent changes, of course.