Without hijacking the thread, I'd be interested also in understanding this forum's views on the cost/benefit of the silver v. carbon tape drive sails from UK.
Fiberglass or polyester fibers. I get the impression it's cheaper. I would be concerned with flex fatigue. Looks like UV isn't an issue. Heavier than all aramids
Lighter, stronger, impervious to UV. Flex fatigue sucks, stretch is almost non existant. It's much more expensive I would assum.
I have no personal experience with either. Just their aramid tape drives. What boat do you have and what are your goals?