Man I dunno.... I was a pretty darn good at the DL for my size (550 @ 175) and could pop out a set of 405x10 but I never got "big" doing the DL. I gained more size when I started focusing on other traditional BB exercises. That said, it is tough to pick just one as being "best." If I could group a top tier (for me) it would be: high rep squat, low-incline DB, and weighted chins.