Hi Robyn!
This is a great question! Choosing my favorite restaurant at Epcot is a bit like choosing my favorite child. There are so many great ones to choose from.
I do have to say that we love Coral Reef Restaurant and dine there on nearly every vacation. The food is fantastic and the view can't be beat! We love watching the aquarium and it is a great way to keep the kids occupied while they wait for their food. It can get a bit loud inside Coral Reef, but it's never really bothered us at all.
My second suggestion would be
Les Chefs de France in the French Pavilion of World Showcase. The menu is outstanding, but not too unfamiliar for children. Our favorite menu item, by far, is the cheese plate. I think it's the best in Walt Disney World! Also, keep an eye out for Remy from the Disney-Pixar film, Ratatouille! He's been known to make the rounds at Les Chefs several times each day (this is not a character meal, so Remy is not guaranteed to show).
I definitely think you can't go wrong with any option in Epcot, but Coral Reef Restaurant and Les Chefs de France would definitely be my top two choices. Please come back and see me again real soon, Robyn! It's great helping you plan your next vacation!
Bon Appetit!
Ashley