Which place should we stop at?

So we're going on our yearly family vacation to Port Aransas later this week, and I started thinking that we're gonna be fairly close to Lockhart on the drive down (we have to go through Austin).  Now I love barbecue, and it's hard to find good bbq in Oklahoma (although not as hard as it was to find in Ohio) and I've heard a lot about how there are three really great bbq joints in Lockhart (Smittys, Blacks and Kreuz Market).  Here is my question:  for those who have been and partaken, if I were to only stop at one of those places, which one should I eat at?  I'm looking mainly at brisket, possibly ribs.  I don't want this to turn into "My uncle lives in (insert random town here) and they've got the best bbq."  Just looking at "the big 3" in Lockhart.