The Cavs this year had one of the worst records in the league. Practically the same team the year before had the best record in the NBA. Put Melo on that same team and there is no way he could have lead them to the best record. Melo has been surrounded with a lot more talent than Lebron and has only made it out of the first round of the playoffs once. And that had more to do with Billups and Camby.
Melo is definitely a better clutch player. He's one of the best in the NBA. And he is probably more talented. But talent and head to head matchups mean nothing. He's very inconsistent and he's never been much of a leader in the NBA. As stated previously, hopefully Amare, and Billups too, can be the catalysts for the Knicks. We certanly can't expect Melo to lead us anywhere because he hasn't shown much maturity or leadership up to this point in his NBA career.