Nylon and polyester both have qualities that are desirable for various uses. To determine which fabric is best used for what, one needs to know what the qualities of each fabric are.
Nylon is softer and stronger than polyester. It is used by the military to make tents, parachutes and rope, and it is also a common component in carpet. On the other hand, polyester is more water-resistant than nylon and also absorbs and holds color better. Polyester is more often used in clothing, particularly athletic clothing. Both fabrics are synthetic and durable, resist stretching and wrinkling well, and are easy to maintain from day to day.