David Lee has touch around the rim. I've seen Lou miss a five foot put back attempt by 4 feet.
David Lee has become a competent if not solid passer. Lou couldn't pass the basketball if it was intestinal gas.
David Lee can actually dribble the basketball. My 7 year old niece can dribble the basketball better than Louis Amundson. But to be fair, my niece can dribble the basketball pretty good for a 7 year old girl.
David Lee isn't a very good defender, but he's become more than just a rebounder. He's active enough to be good for a steal or two each game. Amundson hustles a lot but doesn't give anything much more than rebounding.
David Lee can attack the basket off the dribble. Lou might be able to attack the basket off the dribble by dribbling the basketball off of his foot.