My ABSOLUTE favourite place for Ramen in Toronto. Isshin just seems to do every type of ramen so right. There's a little line up when you go at peak time but its definitely worth the wait!
My personal favourites are their tsukemen, all of their miso, all of their shio, basically everything on the menu!! I have yet to get anything that I didn't like. Note that their miso is slightly sweet and a bit different to all the other ramen places, worth giving it a try once.