They are both just 1 credit. Only you can decide which you'll prefer.
Akershaus is a princess meal. It also includes a portrait package. You get an all you can eat appetizer bar, your main course and then a family style dessert.
Chefs de France is a regular sit down menu restaurant with french style food. The escargot were delicious.
I wasn't happy with Chefs de France but it was because we have food allergies in the family and we didn't know it's not Disney owned and therefore doesn't have nearly the same options for allergy sufferers as the Disney owned restaurants. Those without allergies quite enjoyed their food.
The food at Akershaus ws delicious. Even my fussy daughter found plenty to eat and actually agreed to try new things from the appetizer bar.
We love character meals so between the great food and the princesses and the photo package, we'd do Akershaus again in a heartbeat.