I too would have thought Emma is the best but I don't only because she is far too inconsistent. If she were more consistent, I would say that she definitely shows the most promise. However, sometimes she's absolutely brilliant and at other time she is an absolutely and almost unforgivably terrible actress. As it is, I personally think Rupert's the best because he has the most stage presence (could be the hair) and he's a more or less consistently good actor.