Hmmm... So hard to choose!
I watched Las Vegas first and I swore up and down that I'd never ever watch either of the other two shows. Now I tune into Miami and New York every week and hardly ever watch Las Vegas.
I like all of the shows, but I'd have to say that, oddly enough, my favorite is a tie between Miami AND New York.
Miami has a lot of action going on. Instead of just being there and collecting the evidence and stuff like that, they are out hunting down and chasing the bad guys around. Also, there is always somehting happening on the show and I like all of the drama. The actors are also amazing.
New York is just so cool. I love the city and the "flavor" that it adds to the show. Also, who couldn't love Danny, Flack, and Mac? I mean come on, they're awesome. (So are the others, but those three are my favorites. Sorry!)