you should probably think of it this way: (and I know you know what your talking about) it will perform better with the options for park that he is saying, especially since Nordica has great race skis that are, indeed a sidewall construction. Nordica makes a better ski with its Sidewall construction from my and my friends' experiences. I mean I love my Aces but they are a completely different ski than a cap construction like a Line Anthem. the Line Anthem is made to be an everyman ski that you can do anything with, all while thrashing on it. My Aces are getting a little beat up on the topsheet and metal, but that is because of construction, but overall, skis with a sidewall are generally going to be higher quality and better performing. there is exceptions to everything, and skis are no different. if you look at the Armada Pipe Cleaner, it has a half-cap construction, but that thing has insane edge grip, but still has the cap construction for the most part. I feel that you put this comment in a blunt way, where it certainly has a lot of leeway to go in any direction from the general ideas. You stated that the Redsters have cap and have better edge grip than the Punx, and I have ridden a pair of my friends Redsters and have been to the Starting Gate in Vermont, have seen the double decker construction in all of its forms, and have skied on them as well. I would say that while, yes the cap construction race ski does have more edge grip than any other ski I have ridden, I would like to point out that you dont just straight up leave the ski with cap, you slap on that metal backbone that gives it power and grip. You really cant say that cap, when left alone (in park skis especially) will have better edge hold than park skis with sidewalls. I had a pair of Head cap construction adult skis last year and they had great edge hold, but when it boils down to it, "sidewall stumps all" as my local shop guy likes to say. What I was trying to do in my previous comment, since OP show us that person is not the most knowledgeable with skis and ski construction, is to show him a general idea. You can go much more into detail like you have done, but for him I think to say that a sidewall ski will perform better is a safe accusation.