The preference for a tachi or a katana ultimately depends on individual preferences, intended use, and historical context. Both the tachi and the katana are types of traditional Japanese swords, and each has its own unique characteristics.

The tachi and katana share many similarities in terms of their construction and design. They both have a curved, single-edged blade, a circular or squared guard (tsuba), and a long grip that accommodates two hands. However, there are a few notable differences:

1. Historical Use: The tachi was the primary sword used by samurai warriors in Japan prior to the widespread adoption of the katana. It was worn with the cutting edge facing down and was used primarily on horseback. The katana, on the other hand, gained popularity during the Muromachi period (1336-1573) and became the iconic weapon associated with samurai on foot.
2. Blade Shape: Tachis generally have a more pronounced curve than katanas. The curvature of the tachi accommodated its use on horseback, allowing for efficient slashing and drawing techniques. Katanas typically have a gentler curve, which is optimized for versatile use on foot.
3. Handling: Due to their historical context and intended use, the tachi and katana have slight differences in their handling characteristics. The tachi is often longer and has a greater emphasis on slashing techniques suited for cavalry warfare. The katana, designed for use on foot, offers a balance of cutting and thrusting capabilities.

It's important to note that the preference for a tachi or katana is subjective and can vary depending on individual preferences and the intended purpose of the sword. Some individuals may appreciate the historical significance and aesthetic appeal of the tachi, while others may find the versatility and handling characteristics of the katana more suitable.

Ultimately, the "better" sword is a matter of personal preference, historical context, and the intended use or appreciation of the sword. Both the tachi and katana have their unique qualities and are valued within the realm of Japanese sword culture.