Stainless. Bronze/Brass/Copper smell. Aluminum is too light. And Ti is horrifically overpriced.
2nd best would be chrome plated brass.
Timeless titanium razors are barely more expensive than the SS. About $30 more expensive depending on the options.
Titanium is my favorite for the light weight and corrosion resistance. I hate the price that some charge for the metal though.
Brass/bronze always draws me in for the appearance, but in use I get tired of the upkeep very quickly.