Most are going to say Snelling, and that is fine.... but Snelling is a plodder. He is slow with no wiggle and can only take what the defense gives him.
Norwood is much more dynamic... but he is seemingly always hurt.
So a committee it would be. If they are both healthy, a slight nod goes to Snelling due to goal line carries.
Norwood makes a decent filler in PPR leagues, especially if Turner is down. In 2008, when Turner was a monster, Norwood still put up 800 total yards and 6 TDs in a part time role.