The best type of aluminum strip for flooring is typically one that is durable, slip-resistant, and resistant to corrosion. Anodized aluminum strips are often preferred due to their strength, wear resistance, and ability to withstand heavy foot traffic. They also offer a sleek, modern aesthetic and can be used in various flooring applications, including commercial and residential settings. The thickness and width of the strip can vary depending on the specific requirements of the project, but a common choice is a 1mm to 3mm thick strip for stability and support.