Revolver just. Tomorrow Never Knows is unbelievably spectacular.
Then it's a toss up, Sgt Peppers is flawless. Abbey Road has that amazing medley. The White Album has a ton of mint songs. Magical Mystery Tour has John's three finest moments (and Penny Lane). Even Help has Yesterday, Help, Ticket To Ride, I've Just Seen A Face, You've Got To Hide Your Love Away, and that's one of their least popular albums!
They were amazing. The best fact; between their first and last albums only about 6 years elapsed... 6 years... SIX. I mean wow. Just wow. All of that is 6 years. I mean I adore The Smiths and Dylan... but 6 years. Truly amazing.