Stevens definately gets more snow, alot better snow, better terrain outside of the park, and great jumps in the park. their's also lots of sidecountry access and some hikeable terrain. both mountains have nightskiing but snoqualmie is alot closer to UW.
The only thing snoqualmie has going for it is the park, really nice and innovative rails/jibs, and pretty good jumps too. If your looking to do more jumps, stevens would be the place but snoqualmie has had the rail game for a while. however, if the college pass includes alpental, you will get alot easier access to better snow, backcountry/sidecountry, and really dope terrain.
The bottom line is if your going to be doing alot of everything, like lots of park and powder, i would choose stevens because it is a higher elevation therefore better snow, and you dont have to take a shuttle between mountains to find some good stashes. The park at stevens is really nice with perfect jumps and smooth rails, but both mountains have a good park. If you want a hill close to home and you're going to be doing mostly park but you wanna ski some pow on the good days, Snoqualmie would be a better choice becuase the drive is usually about 45 minutes compared to stevens which is about an hour and a half on a good day. The park is usually bangin at the summit and the terrain at alpental is really sick and is amazing on a good pow day, but due to lower elevation it doesnt get as much snow or as good quality pow as stevens would.
