Not much help, mate, but of the two I have used:
Astra SP - plenty sharp for me to get a two-pass DFS in every razor I own (PPI version)
Derby Premium - roughly equivalent to using the wrong side of a Gem blade
Good luck!
Astra SP - plenty sharp for me to get a two-pass DFS in every razor I own (PPI version)
Derby Premium - roughly equivalent to using the wrong side of a Gem blade
Good luck!