I've been jacking up at the subframe. There's an "official" jacking point on the front, where the dogbone mount bolts up, and I've just been jacking up right in the middle of the subframe in the rear. That's not an officially-recommended spot, although I can't really figure out why since it recommends to put jack stands back there (which frankly seems a bit sketchy to me).
I haven't had the best luck jacking up on pinch welds before on other cars, although the block of wood with a V-notch seems like it would help. Plus, I like to use the pinch welds for the jack stands.
It seems like there's less twisting of the unibody frame by jacking on the subframe vs. jacking one corner at a time--but that may not really matter much.