There's no simple answer because there are too many variables. Google "strength of nylon vs polyester" and you'll see what I mean.

I found this online, but they're discussing rope, not fabric:

"Polyester rope is very close to nylon in strength when a steady force is applied. However, polyester stretches very little and therefore cannot absorb shock loads as well. It is also as
equally resistant to moisture and chemicals as nylon, but is superior in resistance to abrasion and sunlight."
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead