Yeah, if he chooses New York it's about the glory -- saving the Knicks.
And Miami is a big city as far as cities go. But as far as professional sports markets go? Not that big. Miami itself would probably be one of the smaller cities in the NBA -- smaller than Denver, Oklahoma City, Portland, Sacramento, etc.
As a TV market it falls somewhere in the middle of the league. Aside from the cities nightlife and weather, I don't really see what would attract him there.
And what I meant was that while he's going to make a lot of money regardless, someone who has ambitions of becoming a billionaire and a world icon would be best off choosing a world class city like New York, Chicago, or LA. I've never been to Miami (or Cleveland), and I'm sure it's a nice city (Miami, not Cleveland), but it's not in the same category of those other three.