But wouldn't the rubber armour on the GA absorb the shock of falling better than the leatherette on the W model. Porro-Prism binoculars can get out of alignment though more easily than a roof prism. As far as which one is tougher overall I really don't know. A lot of the WWII binoculars used in the field and on ships were Porro-Prisms so they had to be pretty tough.I would guess it would not make a difference. The rubber armor on the GA is not a flak jacket.