Depends what kind of food you want and how much you are willing to spend. Overall Grand Floridian Cafe is a favorite best for the buck kinda place for us.
Cali Grill! If you can’t get an ADR, or would prefer not to be tied down to one, you can sit in the lounge. We stayed at CR last year and went up and had sushi in the lounge almost every day! If you’re looking for QS, Captain Cooks at Poly is our favorite but Contempo Cafe at CR is a close second.