a frequently asked question. I believe it's more a matter of your touring and dining habits than the experience or food. My wife, son and I don't eat a large breakfast and the kids also like to be in the parks first thing so we opt for lunch. I know a lot of people on these boards like to enter the MK prior to rope drop and an early breakfast at CRT allows them to do so.
The food will vary, but the character interaction is the same. Breakfast is all you can eat, but lunch is plenty enough to fill me up without seconds.