This is close for me but I like Stutzle a tad more. The fact that he's already playing against men and his versatility having played all three positions up front gives him the edge for me.
From what I've seen, a lot of Byfield's point come off the rush (which isn't bad per se) and I haven't seen as much creativity in the offensive zone as what I've seen from Stutzle. Also Byfield being so much bigger than the rest of his competition make me queasy a little bit. He won't have that same drastic size advantage in the NHL. Still he is close third for me and would be ecstatic with either guys.