wow, my family has done quite a few as adults and we have enjoyed them all so much. (20-55 years old).
Crystal palace-----We did Crystal Palace on multiple trips and really like it- the food is great and gotta love the pooh characters. Great breakfast buffet.
Cinderella's Royal Table-- of course, was one of our favorites. We had a great breakfast and got pictures of my dad kissing the princesses on the cheek. Food wasn't as good as other ones we have done, but the castle atmoshpere made up for it! It was great. We have also had dinner there very late (I don't believe it was character though) and really enjoyed that.
1900 Park Fare was good as well, but not my favorite. Had Alice/Madhatter, Mary Poppins etc.
Chef MIckey's--- would have to be a close favorite too- we did the character dinner and had a blast. It was buffet style and great selections. Parmesan mashed potatoes were great! We had planned a non-park day our first day and did disneyquest and shopped. We ended the night at chef mickey's and love the food. then we went and watched the fireworks from the top of california grill after dinner. highly recommend this one. I mean, who doesn't love all the classic disney characters?