I'm a legit chicken wing connoisseur, and trust me when I say that Duff's are the best. First the wings themselves, they are meaty with minimal fat, reasonably sized (not too big and from Chernobyl or something) and always cooked perfectly. The art of deep frying is not as easy as you non chefs think, their wings consistently come out very juicy and of course with no breading!
Now the sauce, what can't be said about the best sauce, and the hottest, in Toronto: ARMAGEDDON! Insanely tasty but very hot, I use the blue cheese dip in between wings with the fries (also delicious) to cool down. They make the Armageddon and Death sauce in house, I've pleaded with them to share the recipe but only their father knows it apparently and won't tell the sons.
Cheap wing night gets a little crazy if you don't come early but otherwise the place is just flat out awesome. All the locations are family run, they always rectify any issue and the sauce is the boss! (sorry bad pun)...