Fishnet tights: raw power, style or polyfibres?

When a skipper or companys supply officer have to spend large sums of money on new nets, one of the problems they have is how do they decide which product is the best for which job? What makes things more difficult is that really the only good way to find out whether you have bought the best product for the job is by trying it out or finding someone who has spent a season at work with a particular manufacturers product.