Aluminium is a naturally rust-resistant material which makes aluminium patio doors one of the best weathproof options. Unlike timber doors, you don’t have to worry about water getting into aluminium frames as they won’t swell or warp. This means you don’t need to worry about refinishing them to keep them at their best.
It is unlikely that the incredibly tough powder coating will get scratched but even if it does, aluminium will hold up well when exposed.