Have both. Been driving a Duramax DRW for 6 years with our monster camper it handles wonderfully. This spring we got an older F350SRW and a smaller Bigfoot. It is currently in Houston waiting for a RORO ship to Colombia. Our trial trips with it showed the increased stability, comfortable ride and not getting blown around by trucks, etc. Granted it is tough to compare the older Ford to the GMC with the improved suspension, turning radius of under 2 city blocks, and increased power. We'll stick with the dually for this country.