When it comes to choosing the best material for school lockers, there are several factors to consider. These include durability, security, maintenance, and cost. 

One of the most popular materials for school lockers is steel. Steel lockers are strong, durable, and resistant to damage, making them ideal for the high-traffic environment of a school. They are also available in a variety of sizes and styles to fit different needs and spaces. In addition, steel lockers can be painted or coated to match the school's decor.

Another option for school lockers is plastic. Plastic lockers are lightweight and easy to clean, which can be particularly useful in environments where spills or messes are common. They are also resistant to dents and scratches, and can be available in a variety of colors to match the school's color scheme. However, plastic lockers may not be as strong or secure as steel lockers, and may not be suitable for high-traffic areas.

Wood lockers are also an option, particularly for schools that want a more natural or traditional look. Wood lockers can be sturdy and durable, but may require more maintenance and upkeep than other materials. They may also be more prone to damage or wear over time, particularly in high-traffic areas.

Ultimately, the best material for school lockers will depend on the specific needs and priorities of the school. Factors such as budget, maintenance requirements, and security concerns should all be taken into account when selecting a material for school lockers. In many cases, a combination of materials may be used to provide the best balance of durability, security, and cost-effectiveness.