Obviously this is a matter of personal taste, but I am not particularly fond of Pink's. The chilli on the dog is very good, but the dog by itself with some mustard is so-so in my opinion. My vote goes to Portillos in Chicago. Not the fanciest and there are many small stands with arguably better hot dogs, but consistently fantastic Vienna all beef dogs is why Portillos, Gino's East, and Chicago Chop House are always on my list of places to eat in Chicago.