All three chords of it! And the same ones on every song!
Revolver is a collection of better songs. It's roughly the sum of its parts, though.
Sgt. Pepper's is a better album. It's more than the sum of its parts.
Revolver is also helped by the fact the two songs taken from the album for a single are "Paperback Writer" (a catchy as **** pop song but not one of their deeper works) and "Rain" (okay this one is seriously an underrated psychedelic masterpiece but it can't hold up to the next two items for discussion...).
Sgt. Pepper's nonalbum singles from the same session are "Strawberry Fields Forever" and "Penny Lane," which are two of the best songs in their catalog... of the 1960s... and of pop music generally.
I tend to group their nonalbum singles with the album from the same session (e.g., "Hey Jude" and "Revolution" go with
The Beatles, etc.) because there are not many other bands out there who consistently held their best songs out of their albums but... still made the greatest albums of all-time. I can't think of any other groups that consistently handicapped themselves in that way... it's not like Michael Jackson took "Billie Jean" and "Beat It" off
Thriller to release them as nonalbum singles, right? Hence, I tend to make that adjustment.