The refined manufacturing capabilities of today have resulted in softer Polyester Fabric that in many ways matches nylon and certainly the softness of cotton.
Both nylon and polyester are strong and lightweight due to their polymer-based construction. Nylon is the stronger of the two fabrics with greater stretchability.
Though not as strong, polyester resists pilling better than nylon, which is when fibers unravel and ball up at the end. While this does not weaken the garment physically, it is not attractive aesthetically.
When it comes to fast-drying fabrics, polyester has the edge. Both are naturally hydrophobic, which mean they expel water, ideally to the surface of the garment where it will evaporate.
Nylon actually absorbs some water, which means it takes longer for a wet garment to dry.
Polyester absorbs more color faster than nylon due to the same properties that made it better at wicking water.
Dyed polyester expels the water in the dye but not the dye itself, which bonds with the fibers. Nylon absorbs water, resulting in less dye bonding to the fibers.
Bold polyester and nylon are easy-care Printing Fabric that can be machine washed and dried, though low heat is recommended.