My family enjoys Crystal Palace as well. My boys were 9 and 4 last visit, and had a blast. They really enjoy the food here as well. We've done Chef Mickey's, and while it can be a good time, we feel rushed, crowded, and we're not a big fan of the food. Maybe we just have bad timing, but the food seems picked over by the time we get there. We end up having to wait for new platters (which isn't really a bad thing). But, I have to say the atmosphere in Chef Mickey's is great.
Good luck choosing!