The better metal window and door material in the United States is typically aluminum. Aluminum is favored for its durability, low maintenance requirements, and energy efficiency. According to the American Architectural Manufacturers Association (AAMA), aluminum windows and doors have a higher thermal efficiency rating compared to other materials, which can lead to significant energy savings over time.

Aluminum's inherent strength and resistance to corrosion make it an excellent choice for exterior applications. It can withstand harsh weather conditions without rusting or deteriorating, ensuring a long lifespan. Additionally, aluminum is recyclable, aligning with the growing trend towards sustainable building materials. The U.S. Green Building Council (USGBC) recognizes the environmental benefits of aluminum in construction, contributing to LEED certification for buildings.

Steel, another metal option, is also durable and secure but may require more maintenance due to its potential to rust. Fiberglass, while offering excellent insulation properties, can be more expensive and may not match the aesthetic appeal of aluminum. Wood, while traditionally used for its warmth and beauty, is prone to rot and decay, especially in humid climates.

In summary, aluminum stands out as the superior metal window and door material due to its combination of durability, energy efficiency, and sustainability.