my unpopular opinion as a chicago resident:
chicago style hot dogs are just okay, and have way too much tang to them, with the mustard, pickle, sport peppers, etc. its like a sour piece of bread with poppy seeds, and all of those ingredients slide right out of the small bun with every bite.
My perfect dog is bbq style and here's how I do it:
Score the dog slighly a bunch of times
Grill it till those scores open up and char a bit
Char some jalepeno and onion if you like
Slather dog in bbq sauce
Add cheddar cheese and lettuce.
Grill the bun a little bit. Dogs served with cold or room temp buns suck