This place is one of my favourites. There are over a hundred flavours now that they expanded the menu and before that I had tried every flavour (about 80). The service is always fast, which means that the wings are usually hotter (in temperature) than the average place. There aren't many tables or much space and it's really popular so you may have to wait during prime times.
As for recommended flavours, Pandora's Box, Texan Ranch, Snake Bite, ..., and if you're looking for a coronary try "cheesy where's the beef" which is poutine on wings.