I'd start your research by digging into past posts in this forum. You'll see examples of people building decks with the whole range of materials. We've also had lots of discussions debating and commenting on different materials. When you've narrowed it down to one or two choices, search the forums for all posts on those, and start a thread asking for us to help you decide between the two of them. The decision depends on several factors, which are unique to your needs and wants. i.e., budget, maintenance, longevity, colors, etc.

I haven't been at this forum for quite a while, but when I was, there were so many people complaining about the eventual problems they were having with synthetic deck products like Trex that I would never consider them. A lot of your choices depend on your budget and whether or not this is a do-it-yourself project. I prefer one of the South American hardwoods that are available for looks. If you can afford that, then you can probably afford to have a good decking firm do a fancy layout too. You haven't told us all the details in your case.

We have one quote with pressure-treated wood, a quote with Azek that is double, and one with Trex that is triple. All of these quotes are for a basic 14 x 20 rectangle. We were very tempted by the Azek, but when I did search the site prior to posting a question, I saw very mixed reviews. The same could be said for Trex. It's all about as clear as mud. I am now toying with doing pressure-treated wood for the decking and a white vinyl railing. We may also look into taking a portion of the money saved by using wood and screening in a part of the deck and or enlarging the overall size.

There is no one good material for using for decking. Reason? Every deck has a different orientation to the sun/weather, different location, different intended use, and finishing schedule.Matching the material to the individual location/purpose means a better match and a more usable deck.

Basic info:

Wood needs more long term care than composites. Weather causes wood to split, moisture causes degrading, and sun fades. There are finishes that minimize those problems, but those finishes need renewing periodically.

Both can fade from sun exposure.

Composites(Azek/Trex/etc.) are partially plastic, so they get hotter than wood in direct sun.

Wood can splinter with age. Composites may feather/fuzz.

Composites expand/contract more than wood in extreme temperature climates.

Animals can chew composites/untreated wood.

Some composites are new enough and untested over a long period of time to have incomplete reliability.

Treated wood can be incompletely or improperly treated, causing accelerated wear. Treated wood can be so wet as to impede using a finish(stain or finish) until dry. That can take up to six months.

There are more variances, but what I listed should be sufficient to use to select the best material for your rebuild.