From my experience trying these out, the Crown has a more rigid frame and will allow you to comfortably carry ~35 pounds. The ohm 2.0 has much better features, is around 8 oz lighter, but has a weaker suspension (uses a thin aluminum hoop stay), with a carry limit of more like ~25 lbs.
Edit: I should further specify that I think most of the +25 lb problems with the Ohm's suspension arise from the hipbelt to pack connection point, which is 2 sided velcro. When sufficiently loaded, it seems the belt starts to twist at this point, which results in the loss of rigidity and weaker load transfer. Maybe the original Ohm would work better with the sewn in hipbelt?