So I have been wondering what is the difference between the Astra platinum and the Astra stainless ?
+1 The Astras are quickly becoming my go-to blade. I think that when I get through my current (and varied) inventory, I will probably stick with them for all of my razors.I agree with you. It belongs to the coating.
In my experience the SS blade is sharper at the beginning. But they lose sharpness very fast. After four shaves they become dull.
With the SP blades I get six good shaves.