[FlyingDutchman]

While the composite decking is much more convenient than conventional wood maintenance wise there are a couple things to consider..

The price is substantially more (like 2-4$ per linear foot) than pressure treated wood
Since the cut edges are ugly, not finished and show the composite core, you are limited to picture frame style to hide them
All cuts must be sealed, or they will swell after a while (butt joints turn to bumps)
The hidden fastener system is quite expensive and adds up quickly
The finish is great for decks that are low traffic, but can easily be damaged by dropping, sliding, or normal use BUT unlike wood, they can't be sanded and refinished to look like new
Surface can be slick if something is on it
The color you pick is what you are stuck with

Wood is much nicer and natural looking
Wood is not nearly as expensive
You can change color anytime you want
Decks can be sanded and re-stained which can be a pain, but you can make them look like new (great if you have a dog, they tend to wreck the finish off of anything)
Bugs and water like to eat untreated lumber, and wood likes to cup and bow especially treated wood (as it dries, it shrinks, kinks, and can be a PITA to work with)

There are other considerations I'm sure I skipped, but a deck (like any home improvement) is a big financial investment.