I just replaced all of the 2X6 badly weathered PT boards on my deck.
My joists spanned 2 feet apart, so if I wanted to use the composite
stuff I would have had to beef up the entire deck with more joists to
be 16" OC. So I just stuck with the same PT wood. It was cheaper. And I
think the previous owner did not maintain the deck well. At least now I
know I will maintain it.