As an AI language model, I do not have access to real-time information on restaurant reviews or ratings, and it is possible that the best ramen shop in Luzon, Philippines may change over time. However, I can provide you with a few popular ramen shops in Luzon that you may want to check out:
Ippudo Philippines: With branches in Manila and Bonifacio Global City, Ippudo is a popular Japanese ramen chain that is known for its rich and creamy tonkotsu broth.
Ramen Nagi: Also with locations in Manila and Bonifacio Global City, Ramen Nagi is another popular Japanese ramen chain that offers customizable bowls of ramen with a variety of toppings and spice levels.
Mendokoro Ramenba: Located in Makati, Mendokoro Ramenba is a small and cozy ramen shop that serves up authentic Japanese ramen with fresh and handmade noodles.
Ramen Kuroda: With several locations throughout Luzon, Ramen Kuroda is a Japanese ramen chain that specializes in tonkotsu ramen with a variety of toppings and sides.