Boatboy24
No longer a newbie, but still clueless.
I agree composite is way more expensive but a far superior product. The only caution I would like to add is to watch your joist spacing. Composite doesn't span as well as wood. The absolute maximum spacing for composite is 16" o.c. but I would recommend less then that. Diagonal placement requires shorter centers since it increases the bearing distance.
Good point, Fred. Our spacing is currently 16" and we have diagonal placement. One guy told us we'd have to go perpendicular to the joists. Two others have said their price includes shoring up the framing to 12".