Windells ropetows (they have 2,or maybe 3) are private, just as their lane is private. When we were there, session 5, there were 5 jumps and the features were numerous and the park was set up for endless fun and progression. I don't think it's hard to get to either. 15 minute scenic van ride from camp to the mountain, take the lift up to Palmer Snowfield and drop down to the Windells Lane.
My kids have gone to Windells 4 years now, and it is what it is....."The Funnest Place On Earth"! The camp life is like you said, a blast! As far as things to do in Hood, most campers aren't of drinking age, so I don't even consider that a factor. There is plenty to do if you like the out doors. Most beautiful place ever imo.
I've never sent my kids to Momentum, but looking at the pictures, videos, and comments from people it looks like an amazing place as well. their park looks amazing and beautiful. We just choose to stay in the USA. I would love to visit Whistler one day though. It looks amazing!!