My father's family moved to Lehigh Valley in the 50s, and I have frequented Lehigh Valley hundreds of times since the 70s.
Genos, Pats, Mike Schmidts, Jimmy's yada yada I have tried every Philly cheesesteak hotspot. Cheese wiz is garbage. Allentown uses real cheese, and sometimes a little sauce. The Brass Rail (RIP) used to make a cheese steak omelette that was divine. One of best cheesesteaks I ever had was Augies in Reading.
If you want a good hot dog, get to Yaccos.