Ive been looking at the two also, it seems like the arg is better for charging and speed, where as the hellbents not so much.
They're really two completely different skis, so you'll have to make a decision of exactly what you're going to do with them. I'd only use ARG's if there was 6"+ of new snow, but the Hellbents would probably be fun in any sort of soft snow. Hellbents would definitely get the nod for versatility out of the two you've picked, although they'd both be fun for sure. I've only talked to people who have ridden these though, so hearing from someone firsthand who has ridden both would probably be a better way to make a decision than listening to me. Also, do you want a rockered ski, or is this just an idea you're throwing out?
Then we disagree becaus i think they would be great for 3's off cliffs and booters.They are way light and the center mount or close to center mount would make them great for spinning. So back to the point, why not compare and consider both.