Hellbents: New vs. Old

As of late, I've been looking for a solid powder ski for the northwest. I have a couple ideas in mind, but was wondering specifically about hellbents. I know the dimension differences (1cm throughout, slightly softer flex on the old, flat camber vs 1mm camber, rounded sidewalks, etc.), but how specifically does the performance differ? I've heard that the new version are a step up in float and slightly in carving ability, but is it going to be that big of a difference, especially for someone who's pretty lightweight? Specs: age 16, 130lbs, 5'10", expert skier, like to ski quite aggressively in open spaces and trees, but enjoy jibbing off of features when I see them. Trickery and the occasional park lap included. Thanks!