Assuming I was born in or around New York, I'd have to say the Mets without bias. I'm a big Johan Santana fan, and while I do rock pinstripes pretty impressivly, I like the Mets logo better, and the team's color scheme.
Luckily I've lived in New England all my life and I don't have these choices to make. Boston for the major league stuff, Portland for the minors.