The "ONE" Blade - Which Would it Be?

I would probably go with Polsilvers SIs, closely followed by GSB.

Nacets

There are just so many great blades out there nowadays it is impossible for me to pick '1'. In the 1960s I'd have easily said Gillette Platinum Plus, or maybe Super Stainless. In the mid to late 2000s the Feather. Now ... there are a half dozen to a dozen, that I know of, that are great. A true wet shaving renaissance happening.

Gillette Nacet  .-
Smooth - Sharp - Long lasting .
For my mediterranean heavy stubble
and thin sensitive skin it’s
the best blade ever.By far !


* Gillette Platinums & Silver Blues
are very close matches,
but not as super sharp as the Nacets.
Rubies are as sharp as Nacets ,but 
they lack the super smoothness of the
latter.

Astra SP for the most dependable across the most razors.

Normally, I am not drawn to ONE anything for the rest of your life threads, but I ran into some laser etched Personna Lab Blue blades off eBay and they are like none I have used before, both in shaving performance and longevity. They perform so much better than the sloppily printed ones.

If I were to choose one blade, these would be the selection.

Gillette Nacet tried in a duFour for the first time. VERY impressive. Right there with Timor. First Gillette DE blade ever liked

So far, its my Personna 74.  I'm on shave #7 and still going strong; it seems to be getting sharper?

Israeli Personnas and Nacets have been my favorite razors so far.

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KAI protouch!