Why do you have a vendetta against Bush? You must be a UCLA fan...maybe Notre Dame? They're both great players and they both bring different stuff to the table.
A.D. (if he can stay injury free), will be a franchise player, somebody you can really build an offense around. He's pretty fast, strong as a bull, good hands out in the flat, awesome field vision, and he's a workhorse, somebody who you expect to take on the workload with 30+ touches a game.
Reggie Bush is a home run hitter, period. He can play running back, reciever, and return kicks. With Adrian, you know what you're getting, its just up to the opposing defense to work their asses off and stop him. With Reggie, you're not quite sure what he's going to do. He can stop on a dime, switch directions without breaking stride, and has incredible breakaway speed. He's only gonna get 15 touches a game, but he's a threat to score, or at least grab big yardage, in every single one of them.