It's TA. He's more savvy. Bradley's still a little bit too overeager at times and overcommits on his man.
Bradley hasn't gotten the feel of reading the flow of the offense and playing space. Being beside Rondo he has a perfect view of Rondo and KG, two of the best in the game.
All he needs is a little bit more seasoning. His ability and effort are already among the best in the league.