Do you mean the polyamide and coated nylon?
I got those two, the coated nylon is not really rough, but not as smooth as the polyamide. The main difference is that the coated nylon is so much thicker, it means that any watch you put on it will sit really high on your wrist and the whole strap will be super think. I'd say it's only wearable if you have a big wrist.
I definitely recommend to see it in person and don't order blind, the boutiques usually don't have them in stock.
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