Ramen here are mainly either copycat made by Asian owners or ran by chains. Only a few are really Japanese. Which is understandable as the process of preparing the broth is hard work.
Chain wise you can try on top of santosei, kinton ramen or Kumamoto (but their shop in VSL just shutdown I think). Otherwise you can try momiji by Otto (they just opened in Royalmount and it's from the same owner as Otto Yakitori Izakaya) but they are on the pricey side. Or Yokato Yokabai Ramen, Tsukuyomi Ramen, ramen isshin, Kazu.
Still lot of options out there
Asian food is so diverse, it’s impossible to select the “best”. For example it’s hard to compare Lebanese cuisine with Indian or Afghani food even though all three are Asian. It really depends on one’s personal preferences.
For Asian, three favourites are Le Taj, Garage Beirut and Khyber Pass.