What sword type do you believe is the best for all-around combat?

As an AI language model, I don't have personal beliefs or opinions. However, when it comes to swords, the concept of "best" for all-around combat can be subjective and depend on various factors such as individual preference, combat style, and the specific situation or opponent.

That being said, some sword types are highly regarded for their versatility and effectiveness in different combat scenarios. For example:

1. Longsword: The longsword, also known as a hand-and-a-half sword, offers a balanced design with a longer reach than single-handed swords. It provides good versatility in both slashing and thrusting techniques and can be used for different combat situations, including duels, group battles, and armored or unarmored opponents.

2. Katana: A traditional Japanese sword, the katana is known for its sharpness, strength, and cutting ability. Its curved blade allows for quick and efficient strikes, making it suitable for both slashing and slicing techniques. The katana is associated with the Samurai and has been proven effective throughout Japanese history.

3. Scimitar: A curved sword characterized by its single-edged blade and typically associated with Middle Eastern cultures. The scimitar's design enables effective slashing attacks and is particularly suitable for use on horseback. It has been historically favored by cavalry due to its balance and maneuverability.

Ultimately, the best sword for all-around combat depends on various factors, including user skill and preference, situational requirements, terrain, and the opponent's armor or weapons. Hence, it is subjective and open to interpretation.

Well, lets say its the early 9th-10th century... what then?

During the early 9th-10th century, swords played a significant role in combat, especially in Europe and parts of the Middle East. Different sword types emerged during this period, each with their own advantages and purposes. Here are a few notable examples:

1. Viking Sword (or Carolingian Sword): These swords were popular during the Viking Age in Northern Europe. They were typically one-handed with a broad blade, providing a good balance between cutting and thrusting capabilities. The Viking sword was sturdy enough to deliver powerful slashing attacks but also had a sharp point for thrusting through armor gaps.

2. Arming Sword (or Knightly Sword): This type of sword became the standard weapon for knights in medieval Europe. It was straight, double-edged, and primarily designed for single-handed use. Arming swords were versatile, providing a balance between cutting and thrusting techniques, making them suitable for both mounted and infantry combat.

3. Islamic Scimitar: Throughout the early medieval period, the Middle East saw the use of various curved blades like the scimitar. These swords offered a considerable cutting surface, allowing for effective slashing attacks. Islamic warriors made use of these swords alongside other weapons, showcasing their versatility in different combat situations.

4. Japanese Tachi: During the early medieval period in Japan, the tachi was a popular sword type. It preceded the more widely recognized katana and had a similar curved blade. The tachi was predominantly used by mounted samurai, providing them with a weapon suitable for slashing strikes from horseback.

It's worth noting that combat during this era varied greatly, considering the geographical and cultural differences. The effectiveness of a specific sword would also depend on factors such as regional fighting styles, armor technology, and the skill and experience of the wielder.