I'm sure you're going to get lots of different responses on this. I have heard each one mentioned as
the best one by at least one person over the past year. People have different expectations of a character meal, of the menu options and quality of food, or the importance of certain characters.
From my research on this for our first trip (last year) and our next one (Friday), here is what I understand about each:
Goofy's Kitchen (DLH): You'll see maybe 6 characters. Always Goofy and Pluto (Pluto is out front and a photographer will take a photo of your child with him); the other characters vary. There is a little 'show' portion of the meal where the characters come out together and get the kids up and dancing, so a little more energy than other meals. Wide variety of buffet food. My boys loved this one a lot; they were ages 6 and 2 at the time.
Lilo & Stitch (PPH): 5 characters: Lilo, Stitch, Minnie Mouse, Daisy Duck, and Pluto. Also a little 'show' portion of the meal where Stitch and children play a Musical Chairs type game called Island Hopping. More low-key than Goofy's Kitchen, but still gets the kids up and playing. Buffet breakfast items, both standard fare and Island/Japanese fare. My boys loved this one as well, and it felt less rushed than Goofy's, the characters seemed to spend more time at each table.
Storytellers' Cafe (GCH): Expect to see about 4 animal characters here (Kenai & Koda from Brother Bear, Chip and/or Dale, and others have been seen. More low key atmosphere. I think food can be from the buffet or ordered off the menu. I've heard the Storyteller's food is very good! We will also be trying this one out for the first time.
Ariel's (DCA): the princess meal! Maybe 5 princesses to meet? You are taken to meet Ariel as you check in (and a photographer will take a picture of your child with Ariel), and then other princesses will visit your table as you dine. I think you order off a menu for this one. I have heard mixed reviews of the food at this one.
Minnie & Friends (DL): Six or seven characters, the characters vary but frequently include the Winnie the Pooh characters. I've read the breakfast food is the standard eggs, bacon, waffles type stuff. We are planning to do this one on our next trip, as my DS3 loves Pooh!