Attic, you are being WAY to general. That would be like me saying that natural wood will get dry-rot. Or be attacked by termites, or will splinter and warp.
Here are a few of the various makers:
EON, VerandaT ChoiceDek, LP WeatherBest, GeoDeck, and Epoch Evergrain, Trex. And those are just the most common names.
Not all composite decking is created equal, just as not all wood is the same.
Here is a consumer reports page about decking.