Duster VS Dart

I have never owned a Duster before but found a really nice one and it will probably follow me home this week. Same color as Al Bundys "Dodge" on Married with Children,interior,dash,seats all look near new. Its a one owner car and even has AC that works.
My question is,is there a big difference in build quality between the darts and dusters? I read somewhere that dusters weigh a couple hundred pounds less and are the bodies are more "flexible" than darts. About the only thing I don't like about Dusters is that the rear side windows don't roll down into the body for that hardtop look. I really wanted a Dodge Demon,but cant find one locally.