The Houston Grand Opera recording is definitive, sure. And an excellent performance and recording. I recommend it wholeheartedly.
But my favorite PORGY AND BESS recording, despite the cuts, is the Goddard Lieberson produced/Lehman Engel conducted recording Columbia made in the early 1950s. For my money, Lawrence Winters is the definitive Porgy. Wanna know why Sondheim made a big deal about the goat? Well, listen to Lawrence Winters shout, "Bring my goat!" at the end of that recording, and you'll hear why. And yes, there are cuts, but they don't distort the piece and they're not rewrites. And they're not that extensive, for my money.
I wouldn't touch that Audra/Paulus recording with a ten foot pole. Despite the fact that Tommy Krasker very lovingly produced it (as he does with all of his albums), there was nothing loving about that performance or production. Except for Phillip Boykin's Crown, it was a travesty.