While composite decking is a mixture of natural wood and plastic, PVC decking is 100% plastic material.
PVC decking is even more resistant to mold and mildew than composite boards. That makes PVC a great option near lakes, pools, or oceans, where water exposure can wear on decking faster. PVC decking is also lighter-weight and doesn’t retain as much heat - while it can still get hot in the sun, it’ll cool down much faster.
Composite decking (Fiberon Concordia and Fiberon Good Life) will have a more authentic wood feel and won’t expand or contract as much with temperature changes. It also provides slightly better traction underfoot to prevent slips.