OK, I misread the post, not looking for the best, but quintessential Texas BBQ. I'm going to go out on a limb here and suggest Rudy's. For those who don't know, Rudy's is a Texas chain BBQ that doubles as a gas station. I've been to several myself -- there are minor differences in the product, but I've always had at least decent BBQ, not the best in Texas, but far from the worst. I'd say it is quintessential. The nice thing is that you don't have a huge investment in time or in money. I've stopped at Rudy's after going out to fancy dinner events and had a much more satisfying second dinner. The brisket is generally cooked pretty well. The major issue for me is they go a bit light on the seasoning. I would say that Rudy's is the quintessential Texas BBQ and I would go one step further and pose the question if you haven't eaten at Rudy's, then have you really actually experienced Texas BBQ? In any case, you should plan to stop at Rudy's sometime just to check it off your bucket list. These other BBQ joints' popularity will come and go, but Rudy's is eternal.