Alright, either way, they are both sick camps. COC is famous for having the biggest private terrain park in the Summer. They have crazy variety. Small, medium, large jumps, rails, boxes, wallrides, everything. The snow is better in the summer there I've hear too. Plus, they've got the megabag, a huge airbag that catches you rather than landing. THis way you can get comfortable hitting huge jumps. I have seen videos of kids bellyflopping on it and they are fine so its supposed to be real safe suprisingly.
Windells has a sick staff, it might be easier to go to, you won't need a passport and it looks sick too. I am from AK and have wanted to go to COC for a year or two but can't until Summer of junior to senior year ( Summer of 2010 ) Just remember, that either way will be sick and neither is way better than the other. They are real similar so go for it and have the time of your life.