The best sword for combat depends on the specific combat scenario, the fighting style, and personal preferences of the individual. Different swords excel in different aspects of combat, such as cutting, thrusting, reach, maneuverability, and durability. Here are a few swords that are often regarded as effective choices for combat:

1. Katana: The traditional Japanese katana is known for its balance, cutting ability, and versatility. It is designed for both slashing and thrusting techniques, making it effective in various combat situations. The katana's curved blade and sharp cutting edge allow for powerful cuts, while its well-balanced design facilitates quick and precise movements.
2. Longsword (Arming Sword): The longsword, popular during the medieval period in Europe, is a versatile weapon that offers reach, cutting and thrusting capabilities, and adaptability in combat. Its two-handed grip allows for increased control and leverage in strikes and parries.
3. Saber: The saber, used in various forms by cavalry and military forces, is known for its slashing attacks and maneuverability on horseback. It typically has a curved single-edged blade and a guard to protect the hand. The saber's design is optimized for swift cuts and thrusts in fast-paced combat.
4. Jian: The jian is a traditional Chinese straight sword characterized by its agility, precision, and versatility. It emphasizes quick and fluid movements, making it effective for both defense and offense. The jian's straight blade allows for accurate thrusts and precise control.

When choosing a sword for combat, it's essential to consider factors such as the fighting style, individual skill level, and the specific requirements of the combat scenario. Training and familiarity with the chosen sword are crucial for utilizing it effectively in combat.