That's the great thing about Exile...18 great songs. As soon as it's over you're ready to start back at the beginning. It's the one real 'rock opera'....
Is this supposed to be Stones albums or any album? If it was just the Stones, then, of course, Exile, the most bang for your buck. If it's ANY album, that would be Band of Gypsys.
Beggars Banquet is at the top of my list as far as Stones albums go, Let it Bleed is a close second. But I'd really have a tough time choosing between those and something like 1234 or Ooh La La. However, if it's not cheating, my ultimate pick would be Chuck Berry's Great Twenty-Eight.
Might be LIVE AT LEEDS or YA-YAS.....LEEDS is longer....so by that I might have to choose The Who and Townshends incredible guitar playing....it would keep me in shape.