Being from Buffalo, I'm almost always disappointed in buffalo chicken sandwiches or wings in other cities. But the sandwich I had at ESPN Club was actually pretty good! Never done the one at PH.
There is a Buffalo Chicken Sandwich at DHS, at the Studio Catering Co. However, while it's pretty good, the sauce is NOT Buffalo. One of my friends named it "Schenectady chicken."
Wolfgang Puck Express at DTD has the BEST buffalo chicken pizza. There are two of them and it's the one on the other end away from the Cirque du Soleil.