The pastrami is good at RUB, getting better. The texture is a bit rubbery on bigger bites. Can't compare to Katz's, which is not smokey, but is nirvana. Oooh, Katz's. Mmmm. The ribs, brisket, etc.... at RUB are good 'que. I've eaten there a few times now (once, across the table from P.K. himself) and, like many of the NYC joints, sometimes it is better than others. I'm in the minority that believes the burnt ends are overhyped....
For me (fwiw), the order is:
Daisy May's
RUB
Blue Smoke
Dinosaur
The oreos are best eaten immediately when you get them.