Andy, check out Car and Driver's comparison of the two. They have a whole sidebar dedicated to explaining why they went with the RWD 335i, and not xDrive (basically, it's the more sporting option of the two).
Andy, check out Car and Driver's comparison of the two. They have a whole sidebar dedicated to explaining why they went with the RWD 335i, and not xDrive (basically, it's the more sporting option of the two).