I would be inclined to say Chrysler has leapt ahead of GM in terms of build quality and materials. The brand new 9-5 has build quality issues, and GM has been working to improve its interior for some time now. Chrysler went from recycled plastic interiors with poor build quality to high quality interiors that feature soft touch dashes, stitching, a nice mix of colors and materials, real metal trim and bezels on models like the Charger and Durango. If Dodge can do it in 12 months, what's taking GM so long? GM's got the designs down, they just need to work on the build and materials quality.
Then of course there's Ford, which has all of those attributes plus loads of cutting edge tech sophisticated interior designs.