We ate at both 1900 and Kona a couple of weeks ago - we enjoyed both but it depends what you are looking for.
The food at Kona was excellent, and of course it's not a buffet, no getting up and down a million times. It was very relaxing. The children's menu was not that extensive though, just a few choices, I think my kids had hot dogs. Delicious food, quiet, and relaxing.
For a buffet, we thought the food at 1900 was very good and the character interaction was great - they were a riot. Of course, every time I sat down and tried to eat, one of the kids was ready to go back to the buffet. So, good food, lots of fun, yet chaotic.
Good luck.