I only have a Cordura smoke tarp so I can't give an opinion on larger tarps made from Cordura. I bought mine off of Ebay from a company that makes many different types of tarps from Cordura. They also sell a patch kit but I don't know how well it works.
I really like the lighter weight of the Cordura and it appears to be much more durable than the airbag/parachute material. My favorite part is how easy it folds/rolls up in freezing temps.