The worst thing you could ever do to me is make me chose my most favorite bowl of ramen. There are so many great ramen houses in the city and Ramen Isshin is definitely one of them. Although you won't find them listed on BlogTO's list of best ramen in the city; it's just as well, as I've never had to line up to get into Isshin, like you would normally have to for Kinton, Kenzo or Sansotei.
Not sure of what to try when you there? Go for their famous Black Tan Tan Noodles. The fresh ground sesame will blow your taste buds away and transport you into whole other dimension of umami goodness. If you are one of those people who can never finish a bowl of ramen, I challenge you to leave any of Isshin's tonkotsu broth, chewy noodles or delicate slices of pork behind. It just won't happen.