Hi Jennifer,
You have picked two wonderful Walt Disney World Restaurants for an ultimate princess adventure. While your party would have an amazing time at either establishment, I'll have to go with our family's favorite and choose
Akershus Royal Banquet Hall. When I choose an Advanced Dining Reservation, restaurants that will provide the most amazing and unique experience are always at the top of the list. When visiting Akershus, you're able to interact with multiple Disney Princesses, and create new memories every time. With your larger party, I think the tables and the serving style of Akershus would fit well. Plus, the birthday Guests of honor will absolutely enjoy celebrating with some of the most beautiful princesses they've ever seen!
I hope this helps you with your vacation planning, Jennifer. If you have any other questions, please feel free to ask us. We're always here to help.
Have a fantastical Disney day!