Addicts are more of a park ski with center mounting and all and foils have a foam core (can be good or bad, depends on how you look at it). Don't know much about the Ar6 except that it's a good ski for all mountain and park. You do already have a good all mountain ski for carving and whatnot so choose a ski that will be good in park and good for skiing switch. I'd probably go with the AR6 because it's good for everything, I've also heard Volkl Karmas are great for everything.
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