Sgt. Pepper was more influential, so i picked that one. I agree it has become a bit over hyped, but it did change how many musicians thought about records afterwards.
To bad you didn't add the following British albums to see what the people here think is the real classic
The Moody Blues - Days of future passed
The Kinks - The Village Green Preservation Society
The Zombies - Odessey & Oracle
The Pretty Things - S.F. Sorrow
The Who - Tommy
The Small Faces - Ogden's Nut Gone Flake
Cream - Disrealy Gears
The Great! Society Really Doesn't Like You Much At All.