Having driven both a dsg + manual R32 I have to say the DSG wasnt such a great combo with the V6. Far too quick to change up in auto mode and didnt allow you to hold the gears long enough in auto mode.
Yes, you could always switch to manual mode, but then what is the point??
In the GTI I had the DSG was much better suited to the turbo'd engine. Very quick to find the power when required, but also a little bit hesitant in stop start traffic.
In all honesty it boils down to what you want the car for. Sitting on motorway, lots of town/traffic driving then go for the dsg. If like me you get to have a nice blast every now and then (i.e. fun) then I would chose manual everyday