I would say if I could take anyone to one spot to "get" what BBQ can be as a baseline Louie Muller's is the place I would go. It is the essence of perfect execution without getting too fussy, plus atmosphere.
The biggest issue I have (and it's a small one) is that if you order a beef rib, you are on the hook for at least $35 lately. So it's a once every couple year thing. I don't really have a solution to get around that.
I enjoy the brisket so I would probably get that 3 out of 4 times and set aside the rib. If going with a large crowd, just putting that on the tab can be a hard sell. Most people just want to get brisket, and often times turkey is for some reason a big draw.
That being said, what separates top tier briskets is nearly nothing now. Every place that rates high is just using the Franklin method now and the distinguishing feature might be strictly down to trimming at this point. I can do a Prime packer brisket on my green egg, it's not rocket science, costs about $80 for a prime packer aged 21 days. Aaron I think now is playing with the idea of wet aging 45 days. I still can't cook a beef rib for anything.
Cattleack, Pecan Lodge, Heim, Meshack all more or less just copy Franklin. Hell, a place called 1050 here more or less on their signage says "Yeah we copied it because we couldn't do any better". You gotta try really hard to mess up a prime beef brisket.