Dusty, whoever told you county line was the best BBQ in austin, or the best in TX was smoking crack. It's decent (ive been there plenty), but its nothing special. It's just a BBQ chain that is attractive enough to most people to make it successful.
The best BBQ in austin is probably the Salt Lick, but you'd have to go out to a lot of the small towns in the hill country ~45-60 minutes outside of austin to get "the best BBQ in texas".
Congrats on your top 8 performance. I was glad to see you there.