I am building a deck and have found the least-expensive stainless
screws. For the size I want (#10x3") it's the same price for Phillips
or square-drive. I like square-drive for most applications, but
stainless is another animal, and I don't have enough experience to know
if possibly Phillips will work better for these deck screws.

I have searched rec.woodworking for advice, but haven't found any
directly applilcable.

Any thoughts?