We love Chefs de France. The food is delicious, especially the escargots! My family lives in south Louisiana and my grandparents and parents cooked not just Creole and Cajun dishes but French dishes as well. While it's not mom's French cooking, it is very good.
I would NEVER change to go to Le Cellier. We ate there and were very disapointed. The food was just ok. Honestly, I didn't get the hype.
IMO, you can't compare Le Ches and The Coral Reef. Both are unique.
Le Chefs is, of course, French. The restaurant is a reproduction of a turn of the century French restaurant-very charming.
One entire section of the Coral Reef is a wall of the aquarium. The seafood is delicious.
We always have ADRs for both the Coral Reef and Le Chefs de France when we go to WDW.