I have tried all types of blades from Astra Platinum, Dorco Primes, Gilette Seven o' Clocks, Bevel Blades and Merkur and I think the Feather blades are the sharpest I have tried. Just for context, I've been using a Merkur Futur safety razor at aggressiveness level 6 with Aveeno oatmeal-based shaving gel for four years (sorry, I'm too lazy to lather). While the blade is sharp, I doubt the sharpness, at least given my level of aggression, gets past the point of a less annoying shave with a safety razor. I also don't think the blade stays as sharp as the Astra Platinum for the level of precision I'm trying to achieve. I would recommend that you try feather blades at some point, but I wouldn't recommend trying them until you've shaved for a while and feel like a safety razor. I started out with Gilette Seven o' Clocks and Dorco Prime blades and would recommend them as a beginner's safety razor.
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