What qualities make something the "best" for you?
With kids that age, if recommend any of the pre-park options as the "best," since you'd get in early and get to ride more rides. I think that would be the best experience. So, Crystal Palace, Be Our Guest, Cinderella's Royal Table in Magick Kingdom; Tusker House at Animal Kingdom, Hollywood & Vine at Hollywood Studios, or Akershus at Epcot.
Are you on the dining plan? The character buffets tend to be the best value with kids that age. If not, then the resort restaurants tend to be a better value.
Or, if you're interested in the best food, Boma, Cape May, and 'Ohana tend to get the best reviews.
"Best" is just too subjective. What are you looking for, what do you want to accomplish, and how much are you willing to spend? The "best" meal could be a $500 per person experience at Victoria & Alberts, or it could be a $6 Nutella waffle.