it's all relative. A bigger guy has just as many advantages as a shorter guy in bodybuilding..ever hear someone say "a good big man will beat a good little man everytime"? If you're short it "might" be easier to put on muscle but if your taller you have a bigger frame to work with. What really matters is if your a mesmorph, an ectomorph or an endomorph. If you have a short dude who has tendencies to be more ectomorphic he's gonna have the same problem a tall ecto will have.