I'd be looking at the frame underneath of them. If I understand DRV units, they're built on a box frame whereas Grand Design is likely built on an I-Beam frame.
My guess is the DRV is going to be better built. Hopefully they rely less on Lippert products.
My big issue with Grand Design was it's over use on Lippert ****. In some of the living areas, they don't have hard switches for lights and instead you use a tablet on the wall (or app on your phone). There weren't hard switches for slides and water heater and whatnot. I'm all for technology, but Lippert's quality is questionable and relying on it for "critical" things is scary.
