I would still take the guy who can handle 40 carries a game. Do that and you wear down the defense, and if you have an adequate QB and Receivers, you can win every time.
Bush's 2005 season was one of the best seasons a RB has had for a while now. But I feel like he had a lot of help. USC had a powerful offense, and the most carries he had in that season were 24.
Last year, however, Rice was pretty much the life of the offense. Teal was still a raw QB and not worth much. Rice regularly gets around 25-35 carries a game. He had 37 last night. This is why I pick Rice.