My bbq isn't regional specific. I really got started in bbq doing competitions, where the focus is winning not a region of bbq. I focus ou n 100% wood fire cooking, since many like to use gas, and premium meats, local when it makes sense. My brisket is heavily influenced by Texas, and gets great reviews from southerners and Texans, past and present. But I use a lot more than salt, pepper and garlic. I think if got good behind the scene info most placed in Texas are using more than that in their rubs too. As far as outside of Texas, good bbq is going to sell. Unfortunately so will bad bbq, example Famous Dave's. I don't think any bbq style sells any better than the others outside of those regions. Texas is really trending right now tho. If you're calling it texas- style bbq, just make sure it is., seems like that's what you're working on. Good luck!
