What is the BEST Single-Handed Sword in History?

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I've talked about why there is no such thing as THE ULTIMATE SWORD, the best design of all ever (example: https://youtu.be/ENnwSesef_M). But this time I'm actually going to commit and pick what I consider the "best" single-handed sword for three specific historical situations:
1. Battlefield
2. Duel
3. Self-Defense

And yes, there is absolutely some personal bias and subjectivity in play. There is no way to answer such questions 100% objectively. :)
Relevant videos:

What Makes Swords & Knives Cut Well (Sharpness, Blade Geometry, Etc)
https://youtu.be/V0O4eqnmREs

The Pros Cons of Single-Edged Swords vs. Double-Edged
https://youtu.be/SeoTj3-tLQ0

Stabby Time! - Straight vs. Curved Swords on Ballistic Gel
https://youtu.be/jBZ9Y1KSkos
*** Music credits ***
Outro:
"Highland Storm" by The Slanted Room Records
https://theslantedroom.github.io/steve.yee/
Used with artist's permission
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Видео What is the BEST Single-Handed Sword in History? канала Skallagrim