My vote's for Revolver. Second is Rubber Soul. Given that the two albums could be volume one and volume two anyway, it's no big surprise.
You really need the LP to appreciate the cover - you could look at it every day for a month, go away and come back in a year and see something in the collage that you never saw before. It's amazing.
I also like the job Klaus did on the three Anthology covers and the subsequent "box" packaging. That was very cool also.
(Oh and by the way, the voting worked for me)