This was one of the most asked questions all summer...which to get, AR6s or Walls.
I skied both of them last season, the AR6s were softer and more playful, but still held up well and had a sturdy feel, while the Walls were also very durable, they were stiffer, but they were symmetrical which made them easier to use center mounted (yes, I center mounted both of them).
The easiest way to pick between the two is this:
Volkl Wall if you want a symmetrical ski and you ski more rails than jumps
Armada AR6 is you want an asymmetrical ski/all mountain ski and you ski more jumps than rails
Both work great on jumps and rails, I just found the walls more fun on rails and the AR6s more fun on jumps.