I've done:
Chef Mickey's - breakfast
Crystal Palace - lunch, dinner
1900 Park Faire - breafkast, dinner
Of all of them, our absolute favorite was Chef Mickey's breakfast. It's now a must 1st day for our upcoming trips. We really enjoyed 1900 park faire for dinner. The food was good and the character interaction was great. Breakfast there was a disappointment. I love Crystal Palace because I have a soft spot for Pooh, but if it wouldn't be my first choice. On our next trip, I'd like to do the castle breakfast, despite the so-so reviews. I know I've read lots of great things about Ohana's character breakfast as well.