I went for "Let it Bleed", best album they have ever made?
At school 20 odd years ago the photographer and artistic director responsible for the "Let it Bleed" cover came to give a talk on commercial photography.
Apparently the Stones ( or some of them) were present at the photo shoot. The album back cover shows the "cake" from the front all smashed up. Once the cover photos had been taken Keith R wanted to wreck the "cake" for the back cover and had to be persuaded that in fact the destruction had to be more orderly.
Classic tunes, classic cover,