I started traditional wet shaving last weekend, and already I'm converting a friend of mine. This weekend I picked up a D2 (1958) Flare Tip Super Speed and a K4 (1965) Slim Adjustable. Both are very smooth opening and closing and the aduster on the slim works great, but the finish on the Super Speed is a little better shape. My question is, which would be the best choice to give to my friend for him to get started?