they're both really good. ski porn is just that: ski porn. all skiing the whole movie, pretty fast paced. but the music got old to me; i seriously keep thinking the first half of the movie is the same song. but there is some really sick skiing.
push might have some better skiing, definately better big mountain (ingrid, mcconky, hjorleifson, harrison, etc) but its sooooo daaaamn sllloooooowww. most of the shots are either in slow motion, or across the valley so it looks in slow motion. its like, the entire time you're waiting for it pick up and get intense, but it never does.
that being said, push is better for all around ski movie, ski porn 10x better if you're looking for something to get you stoked to ride.