Belfort via KO. Belfort is a better striker who can KO Sakara. Even if Sakara were to shoot in, he'd be in trouble there. Exciting fight, but a bad fight for Sakara.
Alessio has the power to KO guys, but not Belfort. Vitor has taken shots on the chin from people like a prime Chuck Liddell. Unless Sakara can find a way to break Vitor's will, he can't win the fight.