I agree with the PP. There were a couple of reasons I chose the way I did.
1. Although I've never been to Chefs, we're also trying it for the first time in December (also for the CP package!). We've been to Coral Reef and it was okay. The experience was cool but I wouldn't rush back because of the food.
2. With your kids in mind, I think the earlier show might be a good idea, especially for the younger two.
3. Also, thinking about the distance from the restaurant to the American pavilion for the show, Coral Reef if much further than Chefs. I'm not saying you should never try Coral Reef, but I think for the package, I would pick Chefs (mainly due to the distance factor).
Good luck with your choice!