The "best" sword length is subjective and can vary depending on factors such as the user's physique, fighting style, purpose of the sword, and cultural or historical context. Different sword lengths have their own advantages and disadvantages, and what might be optimal for one person or situation may not be the same for another. Here are a few considerations:

1. Reach and Range: Longer swords, such as two-handed swords or longswords, generally offer greater reach, allowing the user to strike from a distance and potentially keep opponents at bay. This can be advantageous in certain combat scenarios.
2. Maneuverability: Shorter swords, like shortswords or one-handed swords, often offer better maneuverability, allowing for quick strikes and agility in close-quarters combat. They may be more suitable for fast-paced or confined fighting environments.
3. Personal Preference: Sword length can also come down to personal preference and the comfort and control a wielder feels with a particular length. A sword that feels well-balanced and suits the individual's physical attributes and fighting style can be considered the "best" for that person.

Ultimately, the "best" sword length is determined by the intended use, the individual's proficiency and comfort with the weapon, and the specific requirements of the situation. It's essential to consider these factors and choose a sword length that aligns with the intended purpose and the user's preferences and abilities.