The superiority of a katana or tachi depends on various factors and personal preferences. Both swords have their own unique characteristics and purposes.

The katana is known for its curved blade and is typically shorter and lighter compared to the tachi. It is designed for single-handed use and excels in close-quarters combat, offering speed, maneuverability, and versatility. The katana's curvature allows for efficient cutting and slashing motions, making it effective in duels and indoor environments. It became the favored sword of samurai during the Edo period (1603-1868).

On the other hand, the tachi is an older style of Japanese sword that predates the katana. It features a longer blade and often has a more pronounced curvature. The tachi was primarily used by samurai warriors on horseback. Its longer reach and cutting power made it suitable for cavalry charges and sweeping strikes against multiple opponents. The tachi was worn suspended from the samurai's belt with the cutting edge facing down, unlike the katana, which was worn with the cutting edge facing up.

Choosing between a katana and a tachi depends on the intended use and personal preferences. If you are looking for a sword for close-quarters combat and versatility, the katana might be more suitable. However, if you are interested in historical accuracy and the aesthetics of a longer, curved blade, the tachi could be a preferred choice. Ultimately, it is a matter of individual preference, purpose, and context.