Well, I hate to be the odd man out, but I would vote to Chef Mickey's. We tried 1900 Park Fare for the first time on January 3rd. We found to CM waiter (won't mention his name) to be rude, the food was cold, and, with the exception of Alice (who was good) and the Mad Hatter (who gave us arguably one the best character experience we have had in six trips to WDW), found the characters to be boorish and disinterested (re: Mary Poppins, Pooh, & Tigger).
At Chef Mickey's, on the other hand, we never, in four visits, had food that didn't seem warm and fresh, characters that left our kids wanting to stay for another round of table visits, and exceptional service.
While our experience may have been the result of the type of off-day which every establishment is subject to, our visit was so bad that we just don't feel that there is a need to give it a another try.