This store in United Square is the latest addition to the Marutama Ramen chain in Singapore, and is by far the largest in terms of seating capacity. It is also the only 1 located outside the CBD (No ERP) and has decent sized rooms for private gathering. Although Marutama maintains an official "no reservation" policy, you can always call in advance to check if the rooms are available for your party of 8 or above.
My family and I have been going back to Marutama (almost exclusively) for our ramen fix ever since we discovered their store at Liang Court 2 years ago. We tried Ippodu and some other new entrants when they appeared but always girate back to the "basketball ramen". The chicken-based soup is unique, as most other ramen shop use pork-bone broth. This makes the soup lighter in taste and I always managed to finish every drop of it.
At $12 a bowl, it is not cheap, but that is the price you pay for the privileng of eating authentic japanese ramen in Singapore...just look around and count the number of Japanese chefs working at this restaurant.
I highly recommend the Yaki Char Siu and Tamago to go with your ramen. Personally, I like the spicy version of this ramen with loads of fried garlic thrown in. This store also has some new menu not available at the other outlets. Worth trying out.