two different experiences. The Plaza is a nice simple sandwich shop that you have in your town that also serves ice cream treats. Crystal Palace is a large, boisterous, stylish restaurant that is a buffet and has characters. Plaza is definitely quieter and has a wider availability of food.
I have enjoyed both and I wold choose based on what I was looking for. I have enjoyed the food at CP - we usually go for dinner. As I mentioned above it is loud and very active. It is worthwhile for the characters and the food. I don't consider it very relaxing at all. I look at the Plaza as a nice respite, a quick but leisurely meal that's a nice break from the crowds and the heat in summer.