Their symmetrical which makes riding switch easier, same sidecut as forward. nordica's are way more durable than salomon's. And pipe skis are still park skis, I ride s4's and my friend rides pipe cleaners and never never get to ski pipe. A park ski is the same as a pipe ski, pipe skis are usually just stiffer more aggressive.
Just get the ace of spades, they have an amazing perfect flex, stiff enough for big booters, yet you can still butter, its trully magical.