Stevens for sure. Snoqualmie may have more rails and shit, but that doesn't mean anything when they don't know how to properly set them up for shit. Everything will be close to being set up nice, but have some gay ass problem that fucks it up entirely. They just don't know what they are doing, and/or don't care. They also take forever to get the park going. It won't be nice until 2/3 the way through the winter. And never use all the rails and boxes either. They have a lot of nice features, and lots of space to put shit, they just don't know how to NOT screw it up. I hate Snoqualmie.
With that being said, I rode Snoq about 90% of the time, due to the drive. I live in Issaquah and I just never would make the drive out to Stevens. When I did it was awesome and way better, but I pretty much grew up riding Snoqualmie. The choices have led me to move to Utah, which I am doing in 2 weeks. Yay.