Nylon v polyester shell fabrics

Nylon has a bit of give to it. I think I read that in the textile book I'm reading. The extra stretch made up somewhat for lack of articulation and fit. Let me see if I can find some figures.

I found some figures. Definitions are below.

It may be noted that the value of the initial modulus equals the value of the stress
that would be necessary to double the length of the specimen if the conditions at the
origin persisted. It is a measure of the resistance to extension for small extensions. An easily extensible fibre will have a low modulus.

For comparing different fibres, the value of the specific stress at break is used and is called tenacity or specific strength.

Strength, or tenacity, gives a measure of the resistance to steady forces. It will thus be the correct quantity to consider when a specimen is subject to a steady pull, as, for example, in a rope used for slow hoisting of heavy weights.

The breaking elongation gives a measure of the resistance of the material to
elongation. It is thus important when a specimen is subject to stretching, for example
the neck of a garment being pulled over the head, or the warp extension in weaving.

I assumed Pertex Quantum was nylon

pertex.com doesn't specify

nunatakusa.com says it's nylon

A google search shows many references to "Pertex Quantum nylon". It could be mass-misunderstanding though.

Polyester is better at wicking moisture. I assume this means it's more hydrophobic than nylon, giving it more innate water repellency (ignoring special weaves and coatings).