Which would be more beneficial.. I have about a 12 x 6 ( I think ) porch. front and side are open. I need a floor. I was going to use composite deck boards which would cost well over $100. Then yesterday, I thought I would use plywood which would cost under probably under $75. There was some sort of ply wood there that I ripped up. Should I just put down some PT sheets and call it a day?