The Ohm's suspension is a two carbon fiber rods with a flexible plastic rod (delrin) joining them with a hoop. It's very stiff as CF cannot bend much without breaking. Part of what makes the Ohm carry well is that the hipbelt is really stiff vertically but has some nice cushioned padding where it wraps around the hips. The frame works well if it fits the shape of your back, but I found that my shoulders pushed the top of the suspension back, causing the pack to lean backwards.
The Crown has a high-density polyethylene framesheet that is very flexible, but I find it carries well up to around 30 lbs. I haven't gone beyond that with it yet. Part of what makes the Crown carry well is that the side panels of the fabric are curved in a slight "S" shape (similar to the side shape of the Gossamer Gear stay, though less pronounced). This makes the pack hug the back well and gives it traction in the lumbar. The other part of what makes the Crown carry well is the hipbelt. It's fantastic–comfortable and supportive.
I found the GG hipbelt to be better than the ULA belt. But if I could figure out how to get the ULA suspension to fit my back better, I would go with it–hands down.