What a coincidence: I used Feathers for the first time yesterday: When it started it was beautiful like someone tickling my cheeks. What a nice feeling.
However it lost sharpness at the end,
but was still good.
I am still trying blades, and I have others which have an average sharpness higher than Feather . Having said that, the WTG shave with the Feather out of the pack was sublime.
So far a mild razor (Merkur 34C) is working for me well with a sharp/aggressive blade.
Some of the sharpest blades I have found (Other than Feather)
BIC Chrome Platinum
Gillette Nacet
Gillette Perma Sharp
The classic double edge seems to be the shaving enthusiast choice by far and away.
There is a wide choice of modern, brand new double edge razors and even more choice of blades.
I think this is likely because a new single edged blade is going to have to be made to cut cardboard. Double edged blades are much thinner, made only for shaving. And there are two sharp edges for the price of one.
The modern plastic cartridge blades, when you study them, are exactly the same gadget in principle as Gillette patented. One to five razor blades, with a guard to align them and keep the shaver from slicing himself.
The modern cartridge blades trade extreme closeness for safety and comfort. With a Bic disposable it’s hard to nick your face, even dry shaving.
The variables are how thick the blades, the angle of the edge, angle of the guard, weight of the razor, the amount of blade exposed, blade coatings, sharpness, and keenness, plus the new ones have aloe strips.
Gillette had to work out the same problems in 1904 using machines of his era to mass produce a profitable product. It’s amazing he did so well.