Amy,
First off, I think you will love this dining experience!
Restaurant Akershus has a wonderful array of princesses for your daughter to meet. You can see their lunch and dinner menus now on the Walt Disney World website (see link above).
I personally have always liked the Norwegian food that this restaurant offers. I used to come here long before it was a character meal, as I found it to be a wonderful new dining experience that I could not get back home.
But Norwegian food is not to everyone's liking. If you have finicky kids, you might prefer the breakfast, which is stocked with more American standards. Either way the entertainment is great, so that is not a reason to choose one meal time over another. I would instead decide based on your kids dining needs, and then based on your schedule. And if you don't get to choose, based on availability, I think you should still come here. It is a great place, and an experience not to be missed!
I hope that this helps?
Have a magical (and delicious) vacation!