The comparison between a curved sword and a straight sword in terms of which one is "better" is subjective and depends on the specific criteria, combat style, and intended use. Both types of swords have their own unique characteristics and advantages. Here are some considerations:

1. Cutting Ability: Curved swords, such as the katana or scimitar, have a curved blade that concentrates the force of a strike on a smaller area, enhancing the cutting ability. The curve allows for efficient slashing and slicing motions, making them effective against unarmored or lightly armored opponents.
2. Thrusting and Stabbing: Straight swords, like the European longsword or the Chinese jian, typically have a straight blade that is well-suited for thrusting and stabbing attacks. The straight blade allows for precision and accuracy when targeting specific points, making them effective against heavily armored opponents or when aiming for thrusting attacks.
3. Maneuverability: Curved swords, with their inherent balance and weight distribution, can offer good maneuverability and agility. The curvature allows for efficient flow in cutting motions and can be advantageous in close-quarters combat. Straight swords, while typically heavier, can still offer maneuverability and versatility depending on their design and handling characteristics.
4. Historical and Cultural Context: The preference for curved or straight swords can also be influenced by cultural and historical factors. Different cultures and time periods have favored specific designs based on their combat styles, tactics, and traditions. For example, curved swords like the katana hold significant cultural significance in Japan, while straight swords like the jian are revered in Chinese martial arts and culture.
5. Personal Preference: Ultimately, personal preference plays a significant role in determining which type of sword is considered "better." Factors such as combat style, individual skill, comfort, and familiarity can influence a person's preference for a curved or straight sword.

It is important to recognize that there is no definitive answer to which type of sword is universally "better." Both curved and straight swords have their own advantages and intended uses. The choice between them depends on the specific criteria, combat style, cultural background, personal preference, and the specific requirements of the user.