Headlight Door Question

[GSJoe]

Although it's not confirmed at the moment, from what my godson Clint is telling me we will be doing a headlight door gear replacement within the next week on his '90 ZR-1. An online search suggests we have three choices for gear material: plastic, brass and aluminum. I am leaning toward brass because it is probably more durable than plastic, but aluminum gears are somewhat less expensive than brass. Any thoughts, suggestions would be greatly appreciated.