The choice of the "best" metal for sword making depends on various factors, including the desired qualities and characteristics of the sword. However, traditionally, high-carbon steel is considered one of the best metals for sword making due to its specific properties and historical use in crafting high-quality blades.

High-carbon steel typically contains a higher percentage of carbon compared to other types of steel. This results in a harder and more durable blade with excellent edge retention and cutting ability. High-carbon steels, such as tamahagane (traditional Japanese steel), spring steel, or tool steels like 1095, are often preferred for their combination of hardness, flexibility, and resilience.

Other factors to consider when selecting the best metal for sword making include:

1. Heat Treatability: The chosen metal should be capable of being heat-treated to achieve the desired hardness and flexibility suitable for a sword blade. Heat treatment involves precise heating, quenching, and tempering processes to optimize the metal's properties.
2. Tensile Strength and Toughness: The metal should possess sufficient tensile strength and toughness to withstand the forces and impact experienced during sword usage. A balance between hardness and flexibility is crucial to prevent the blade from becoming too brittle or prone to breakage.
3. Corrosion Resistance: While high-carbon steels are renowned for their cutting ability, they are generally more susceptible to corrosion. Implementing proper maintenance practices, such as regular cleaning and oiling, can help mitigate corrosion issues.
4. Craftsmanship and Skill: The skill and expertise of the swordsmith are crucial factors in crafting a high-quality sword, regardless of the chosen metal. The swordsmith's understanding of metallurgy, heat treatment techniques, and blade geometry greatly impacts the final performance and quality of the sword.

It's important to note that there are various types of steel and alloys that can be used in sword making, each with its own advantages and considerations. Modern swordsmiths may also experiment with combinations of different metals or alloys to create blades with specific properties or to achieve desired aesthetics.

Ultimately, the selection of the best metal for sword making depends on the specific requirements, preferences, and intended use of the sword, as well as the skill and knowledge of the swordsmith.