MHSSC (Mt. Hood Summer Ski Camp) for sure. You get 6 days on the snow, and it has pretty much the same park as Windells, minus the huge ass stepover and a few rails. Windells has more media hype, but costs almost twice as much. Windells also has a huge offhill campus with skateparks, dryslopes, and all the top pros. I've never been to windells, but i have friends that have and have told me that at windells, you dont really learn all that much from the coaches. A lot of them are mainly there to train themselves and so they dont focus as much on coaching the campers. MHSSC on the other hand focuses more on coaching and learning new tricks, plus they have a trampoline there too to learn tricks on. Both camps provide all your meals, but at windells if you want something to dring or eat other than water you have to pay for it at their overpriced snack bar, wheras mhssc has a 24 hour free soda machine. So really, if you want to go to a camp and just ski and not really learn, it would be windells. but if you want to go to a more affordable camp that you learn alot from, i would recommend MHSSC.
http://www.mthood.com/freeski.htm is the MHSSC website