Too close between the first 4 albums because I love them all. When I think of Agents of fortune...That was my intro to BOC & the mystique of the album artwork mixed with songs like This Ain't the Summer of Love, ETI (which blew me away), Don't Fear the Reaper, & my favorite from the album "Tattoo Vampire" almost gave it my vote but I went with their debut album because "Stairway othe Stars" is my fav BOC song plus Cities On Flame & Before The Kiss just added to it