Living in Austin and working 2 blocks from Stubbs for many years I am amazed at all the Stubbs votes as well as other Austin sauces (Rudys and Salt Lick - both very good). For those who like Really Hot Wings (seriously very very hot) try Stubbs Wing Sauce if you can get it. FYI - their bb'q is terrible! I did see Merle Haggard there live one time long ago: It stuck with me as "I Think I'll Just Stay Here and Drink"
I would like to find a good North Carolina Vinegar Sauce in a bottle if someone knows of one, hard to beat on pork.