I'd go for non-stainless outdoor screws. Stainless screw are too weak/brittle and should only be used where the screws will be visible and even there I'd consider some sort of coated screw instead. And as @russmeyer says: Torx all the way.
@JesperXT started
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I'd go for non-stainless outdoor screws. Stainless screw are too weak/brittle and should only be used where the screws will be visible and even there I'd consider some sort of coated screw instead. And as @russmeyer says: Torx all the way.