I'd have to agree that the Beatles have the best overall body of work as a rock band. Lots of highs and not a lot of lows. The stones have some great songs - "Gimme Shelter" is probably as good (or better) than any Beatles tune, but the Stones also produced a lot of average music, in my mind.
I'd say "While My Guitar Gently Weeps" take the cake for the best song with the cheesiest line: "I look at the floor and I see it needs sweeping, while my guitar gently weeps."
"For the Benefit of Mr Kite" is probably one of the best things ever written (up there with Gimme Shelter)
I know there are a lot of Clapton haters on this thread (or at least folks that think he is overrated), but I think the "Layla" album is one of the best, complete albums every produced. Clapton really needs a strong collaborator to shine, and on Layla he had Allman as well as the other guys in the band (Bobby Whitlock, Jim Gordon, etc).