I'd take Dirk tbh.
I really liked Melo but he's just another one of those incredibly talented players that doesnt seem to care. Always smiling and lollygagging on the court. You know guys like Duncan, Kobe, Manu, Rose, Durant, and even Wade are all business and go hard all game. While gots like Bosh, DHoward, and at times LeBron seem to care more about looking cute out there on the court. I hate this new era of superstars that think its cool to look disinterested or something, or to smile all game long. Dirk falls into the former and Melo into the latter imo. Completely irrelevant to their talents but I dont see those type of disinterested players leading teams to les. Even Dirk has a better chance at doing that. Give me him.