My problem with most of the composites is that they sit on top of deck boards (deck toppers) or emulate deck boards in size and profile. Those types are often available in stock at big box stores. Problem there is that water drains between them just like deck boards, which can cause problems underneath. They make a tongue in groove version that stops that from happening. Whatever is below stays dry due to surface channeling that directs water to the edge of the deck. You can seal/caulk along the groove if you need to.
I did a 6x12 porch with that 15 years ago (have no idea the brand or manufacturer) or more and it's held up pretty well. I have fiberglass panels over it as a roof, but the sides are open. It has faded quite a bit and I'll probably paint or stain it someday. It has a few surface nicks and flaws from foot traffic (stones in shoes, etc.) or where I dropped things on it. But there is no cracking, curling, shrinking or anything else typical of wood decks. It's still made by a few different companies, but can be hard to find and usually has to be special ordered. What I got was a little more than double the price of deck boards.
It's also quite a bit lighter since the bottoms are recessed meaning less material than boards.