I can only tell you what I shave with.

I have a Geo. W. Korn (Which made Case Razors) it is the best American Steel Razor I own. My Union Cutlery Spike and Torreys are very close seconds.

My new Dove (10 years old) shaves ok, I am not a fan of the steel.

My Solingens from days of yor are good shavers but I find that the older the blade the better the shave.

My Sheffields, well currently I am not speaking with one of them I am having problems with the edge. But the others are the same as the Solingens.

My Japanese str8. Wicked sharp and a good shaver.

I do not own any new fangled customs.

The heart of your question, correct me please, is this. What are the differences in the steels?

Some makers hit on the magic ingredients, some makers hit on the magic hardening, some makers hit on a good grind.

I know that my Korn is a full hollow and weighs nothing, the edge is thin as 2.0 beer and it shaves like a light saber. I do not know if it is the grind, the steel, or the quenching process, but whatever they did they did it right.