I can't tell the difference between Astra SS and Gillette Silver Blue either. Astra SP aren't sharp or smooth enough to me.The SS are just as good to my exceedingly handsome face as the Gillette Silver Blue ones. I'm not sure if I could tell the difference between them in a blind test. And the Astra SP is really good for me after a couple shaves.
Blades is weird my friend. Everytime I see someone showing love for Derby blades I scratch my head, lol! Those blades hate me!
Sent from my SM-G975U using Tapatalk