I love my msps soooo much, best all mountain ski on the market in my opinion, but i havent ridden the ar6 so i cant judge to well. But the msps are light enough for some park, real solid ski on jumps, great in trees.
^ sums it up real good. I also would suggest Msps, i have the 06-07 and havent had a problem with them yet. The only thing is they are a little stiff and the top sheet chips but what who the fuck cares about that.