Composite Hollow Decking is, simply stated, plastic. Usually extruded, sometimes reinforced with glass fibers, carbon fiber, or even… wood. When plastic composites came into the mainstream in the 1980s and 1990s, it was often plagued with problems – warped, ugly, broke easily, etc.
Fast forward to now. Most of the problems of the past have been solved. Composite Decking is almost always more expensive than wood. It can also be made to look so much like wood, you’d have a hard time telling a composite deck from a high quality wooden deck.
Composite decking never needs painted (but can be painted), never rots, is stronger than wood, and will probably last longer than the best wooden equivalent.