If you are packing without much off angled clambering, without trying to bushwack through heavy cover, and you are able to pretty much walk upright, especially if using the aid of hiking staffs, even if hiking up and down steep grades; I'm of the opinion that nothing carries large, bulky, super heavy loads better than a good framed freighter pack such as the Barney's. Don't think you can get any better than that if you have the personal goods to pack monster loads.
On the other hand, such a bulky freighter pack is a pain in the rears to maneuver through obstacles while clambering hard. In that case, I prefer a more athletic design. But then again, I cannot carry but so much weight safely when doing such clambering.
Best