McDavid. I would put Bure in the superstar category with players like Forsberg, Hull, Sakic, etc. I don't think he's quite in the same tier as McDavid is projecting to be (Generational: Lemieux, Gretzky, Crosby, arguably Ovi). Even then I wouldn't quite put him on the same tier as the players between generational and superstars (eg. Malkin, Yagr, Messier).
Bure: Amazing player and a lot of fun to watch. I hope people aren't getting the impression he wasn't a great player. I think we all can see how great he was.