I am a fan and regular user of many Russian blades. Here are my ratings on my YMMV scale of 1-10 (10 being best): Voskhods: 9 but only get 2 good shaves from them (in any razor). Rapira Swede: 9.2 and get 3 good shaves (in any razor). Rapira Lux: 9.3, get 3 good shaves (in any razor), + I like it best in the R41, which is temperamental with blades. Polsilver: 9.5, get 3 very good shaves (in any razor). Ladas: 7, get 2 decent shaves but only in a Fatboy or Slim set on 9. Under-performs in other razors. Astra SP: 7.5, get 3 decent shaves (in any razor). GSB: 7.5, similar to Astra.
I find Voskhods. Rapira, Astra's and Ladas rough. I still like them though. But to me the best Russian blades are Perma-Sharps ( the russian version), smooth sharp and long lasting.
I have only tried the Voskhod, I like them about as much I like the Gillette 7 o'clock sharp edge yellow box. The Gillette sharp edge are the only blade I bought in bulk so far.
I have/used all three you've mentioned. I guess I prefer the GSB . Hope that helps? My daily blade is Personna lab.
