If you like wiz, then get that, but if we’re talking about traditional cheesesteaks, the default in Philly is American. Most shops also have wiz and provolone. Lots of shops do a pizza steak, which has mozzarella and pizza sauce, and most places do a special steak, too, which has peppers, onions, mozzarella, and pizza sauce.
In conclusion, don’t hate on somebody else’s preferences, hate on people being assholes about it.