A flat head also has the benefit of letting the water run off it.
A Phillips screw will collect water in the screw seat, a flat head, if it’s lined up vertically, will let water run out of it, so flat heads are (generally) better for outdoor use, because they are less prone to rust compared to Philips screws.
A flat head has a better grip on the tool, and is less likely to shear, or deform under pressure.
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