IIRC, Carolina is vinegar based while Texas tends to be tomato based.
I'll pimp my friend John (and Dale )Reed's book on the subject. It details a lot on the subject in general and the breadth of NC barbeq in specific. It'll leave your mouth watering
The best is here in East Tennessee at Woodridge BluffCity Tennessee.
Next is Coopers in Ilano TX
We are headed to Texas boon docks in May to search out equal or better.
Actually even in NC there is a conflict that rivals the civil war concerning tomato sauce or ketchup in barbecue sauce.
Eastern NC (my location) is vinegar, peppers, sugar and a few spices but the idiots around Lexington NC have decided that it needed color so they adulterated the real thing (they even put ketchup in the slaw)and it is known as Lexington style.
Eastern North Carolina is vinegar based. . however, central and western North Carolina; it's tomato-based. BOTH are DElicious!!