I literally grew up cooking and eating BBQ in West Texas in the 1950's. My Dad made a BBQ pit circa 1955 out of various sized pipeline available in the oil patch. We used to cut our own mesquite to make the fire. We BBQ'd all the time. It was the primarly social interaction for my family and our friends. The rare occasion we would eat out would be at Johnny's BBQ in Midland which had home made tables and sawdust floors. It still operates today sans the sawdust floors.
As an adult I kept the tradition going and have eaten BBQ all over the country; Texas, KC Kansas, South Carolina (which they can keep), Tennessee, you name it, as well a smoking some pretty decent stuff on my own wood burning pit. So I have, I think, a pretty broad knowledge and palate for BBQ.
Here is my list:
#5 Goode Company Kirby location in Houston: very consistent mesquite smoked brisket and the best potato salad I have ever eaten.
#4 Interstate BBQ Memphis: Best pulled pork sandwich going, moist and with a cole slaw topping.
#3Kruez BBQ in Lockhart, Tx: Haven't been to the new location yet but the old location had great sausage and shoulder clod. And you just gotta love a place where you have to step around the fire to get to the pit.
#2 Luling City Market, Luling Tx Absolutely great ribs and sausage. Superb sauce. Grab a hunk of onion, cheese and a Big Red Soda to go with it. The real deal. Could have been my #1. You won't get cheated if you only make to Luling City Market.
And the Grand Champion #1 BBQ: Louis Mueller's in Taylor, Texas: Go through the swinging screen doors to that big old room with sooty smoked walls and the best sausage, brisket and sauce served by the lb. on butcher paper on the planet. The sausage is coarse ground. Once you've had it nothing else compares. Two kinds of sauce. I love boffum. If I could only eat at one BBQ joint, this would be it.
Honorable Mentions: Williams Smokehouse (ribs) in Houston, Southside Market (sausage) in Elgin, Tx and Cooper's BBQ (sirloin) in Luling, TX., Rendezvous (dry coated ribs) in Memphis although I did kill my wife's dog by feeding her a slab of their ribs in 1992. Choked on a bone I think.