As far as the diff between cable and hydro discs,hydros require less regular maintenance(they self adjust for pad wear and no cables to adjust/lube) and have better feel. Cables are a touch lighter,cheaper,and it's easier to lengthen/shorten them if you make a drastic change in your handlebar.

As for whether you'd see any benefits;hard to say. Hydros would require less maintenance,cables would require fewer adjustments for the pads,and the pads are generally easier to change. In both cases,you have to make sure when removing/installing the wheels that you remain consistent in the tightness of the skewers or you'll get brake rub. So it boils down to how much wrenching you want to do on your bike. Also,this all might be moot since the majority of DS bikes have discs,except the lowest base models,so the ones you're looking at might only come in disc.