What is your primary goal? Good food? Seeing Mickey & Friends? Or seeing Pooh and Friends?
Because if it's good food you want, and characters aren't important (or you like Pooh's group best), Crystal Palace has better food and is right in the park. You could eat and watch the crowd from the windows, and be right there ready for the party. Like someone else said, Chef Mickey's will have you competing with other guests for dinner that night, where CP will be party guests only (or stragglers, but still not many of them).
If you need action and to see "THE Mouse" and you don't care if the food is sub-par on a bad day, and just so-so on a good day, then Chef Mickey's is the one you want. If it weren't for my kids, we'd never go back to CM and go to another restaurant that features "the Mouse" and check off the box that way!
Good luck - both are fun!