The answer to your question is it depends. Suspension should be adjusted based on how the car is reacting and your driving style, no one can really give you a "this is the best," scenario because there really isn't one.
That being said, Stiffer would naturally be a little better, but its worth playing with. Assuming you have a square set up (same tires front and rear) start with your suspension all adjusted the same. If you encounter under / oversteer THEN adjust accordingly.