This comes directly from Philly's tourism bureau -
I'm a Pat's fan, myself, but that's just because Geno spells his name with an "e." I hear from most people that Geno's is the best in town, but I'm incredibly stubborn, so I'll never know. Plus I hear Geno worked for Pat and left to open a rival across the street. Don't know if that's true but it sounds pretty lame to me.
If you're looking for a good cheesesteak in South Florida, the place to go is, without a doubt,
Mr. Z's, but it's in Key West, so...you know, if you're down there or whatever, you should really go there. Pizza is fantastic, as well.