I am not a synthetic deck person one bit. Trex has failed, vinyl composits have failed, whey to make something better that is already good, Natural wood.
A well cared for natural wood deck will last 20 years with proper maintenance. The biggest problem people have is not cleaning out the spaces between the boards and the infamous "ponding" occurs. Each spring, with your garden hose on high pressure, clean out those gaps and let the water fall down to the earth.
Too many people have been "hit" by these synthetics.