The determination of the "best" sword is subjective and can depend on various factors such as the purpose of the sword, the historical context, the intended use, personal preferences, and the criteria used to evaluate its qualities. Different swords excel in different aspects, and what may be considered the best sword for one purpose or individual may not be the same for another.

Here are a few swords that are often regarded highly for their quality, craftsmanship, and historical significance:

1. Katana: The traditional Japanese katana is widely admired for its elegance, sharpness, balance, and historical significance. It is known for its cutting ability, versatility, and the unique construction techniques employed in its creation.
2. Longsword (Arming Sword): The longsword, also known as the arming sword, is a versatile European sword that was popular during the medieval period. It offers a combination of reach, cutting and thrusting ability, and adaptability in various combat situations.
3. Rapier: The rapier is a slender and agile sword developed during the Renaissance era, primarily used for dueling and personal defense. It is known for its speed, precision, and its emphasis on thrusting techniques.
4. Dao: The Chinese dao, also known as the Chinese saber, has a curved single-edged blade and is celebrated for its power, versatility, and historical importance in Chinese martial arts.

Ultimately, the "best" sword will depend on individual preferences, the intended use or context, and the cultural or historical significance that resonates with each person. It's important to consider the specific qualities and characteristics that matter most to you when determining the best sword for your needs.