Carbon fibre is unbelievably expensive and twice that to work
with. Kevlar is easier and cheaper, but still more expensive than Dynal.
The cloth itself is not what you need to give you the abrasion resistance. Look at it this way, if you have worn down to the cloth, you have worn to far anyway. You need an anti-wear coating applied to area's of contact, to protect the surface below. i.e the paint/gelcoat, resin/fibre. If the designer
is happy that Dynal be used, then I would keep to what he suggests. That's the guy that should know best. Then make sure you place some protective barrier such as Epoxy
carborundum on any contact area.