ARGs: stiffer, straighter, low profile rocker, fatter waist. They will be better for charging pow, spring corn spring slush and crud.
EP Pros: soft, red sidecut(w/taper), larger rocker. They will be better for jibbing around, and maby in park(although the flat spot Bents have isn't there on EPs, and they are soft throughout, so park is...different but many people do it).
If you have a park ski, I would get ARGs of these two. Personally, I will never own EPs because they are so damn soft, and now there are rockered pow skis that can't sink and still turn on a dime, also aimed at pow jibbing that are stiffer(like LL2s).
they have a flat spot
the rocker profile is very similar too the bents
I would get the args out of those two but you should also check out moment night trains, moment donner partys, armada jjs, atomic bentchetlers and the ON3P line.
they are by far the best pow ski i have ever ridden.