As masraum stated, it isn't about the sauce, but the meat and how it is cooked.
I'm pretty sure slathering good Texas BBQ with sauce would be enough to get you lynched.
In the south cooking on a grille isn't BBQ, that is just grilling. Just moving a few zip codes in NC and Tennessee is enough to completely shift the style of BBQ you are likely to find.
According to these guys it isn't BBQ unless it is pork and you are cooking the whole hog.
Whole Hog from Joe York on Vimeo.