Honestly man, ive been to summer ski camp before, and really no matter which one you chose, youll have the time of your life. This is just my 2 cents on what ive experienced and heard.
Momentum-
Biggest thing momentum has going for them is their private T-bar, this allows you to lap quickly, and ski til youre dead, only downside is that the lane is so steep, so you only get a couple hits in. Other than that diggers work unbelievably hard setting features, and changing things best for campers.
Skiing 7/10
accommodation 10/10 but its in a hotel, so you cant get to rowdy
Windells
Windells park always looks unreal, big jumps, fun rail options, only thing is, you need to ride the rope tow, which in my personal experience is slow and all around not a fun time. Also windells usually packed with pros, which means more pro hoeing, but a busier park, so the choice is yours
Skiing 8.5/10
accommodation 7.5/10
Apparently after skiiing at windells is boring as shit, and if you dont skate, there not much to do except jack off.
Camp of champions
COC's park is BY FAR the best summer park in the world, Their XL jump line is always mint, they have tons of rail options and its groomed every night unlike windells, and Momentum. Only shitty thing is COC shares a T-bar with the public lane, and the race camp, which means 10-15 minute lift lines.
skiing 10/10
accomodation 7/10 (at coc you stay in the staff housing which youre basically allowed to trash, skate in the hallways, put holes in the walls, its cool)
Hope this helped, have fun at summer camp!