These are such different restaurants. If you decide on GG, just make sure you insist on the lower level so you can see the environments below. Both are fun. If your party is HUNGRY go for GG. The portions at CR are small and much more beautiful visually. The wine and cocktails are better at CR. However, my kids love the peanut butter play dough at CR. GG gives you enough food to sink a ship. One of the funniest meals we ever had was at GG. We were one of the last groups left and Chip and Dale TPd the whole restaurant with the paper towel rolls used for napkins. You cannot go wrong with either. If you want better food, and like your food more gourmet, go for CR. If you want peace, go to CR. If you want wild entertainment, go for GG for the antics of the characters. Better yet, book GG for the Ice Cream Social and CR for lunch or dinner.
Carla