Mary,
Of course everyone has their own opinion, but to me the best choice is the
Disney Princess Storybook Dining Experience in the Akershus Royal Banquet Hall. There are always several different princesses on hand, and if your daughter is at all like mine, her favorite princess is a rotating role that can't always be predicted. This way you stand a chance of hitting the right note when you arrive.
I have either seen, or heard friends seeing Ariel (in a dress), Belle, Snow White, Sleeping Beauty, Jasmine, and sometimes even Cinderella.
The setting is very magical, and I think the food is better. Don't get me wrong, Cinderella's Gala Feast is very good food as well, but I preferred the cuisine here (and have come back several times, just to make sure!).
Another benefit is that getting a seat here is easier, and it is equally magical, whether it is breakfast, lunch, or dinner!
Please feel free to ask me any follow up questions if you have any by visiting my bio page, and have a magical vacation!