That is not a single or quick answer. Every area has its own from Texas to the Carolinas. Then that can be broken down to areas inside the states.
Each as individual as the next.
I think there is a certain soul in it. A blend of taste that come from a large mix of cultures.
What type is it that he seems to like? Sweet, hot, spicy, saucey, dry?
Mustard, vinegar,tomato base?