Aftermarket fairing-stays have replaceable "arms" to them, so in a crash, they bend/break and replace. OEM fairing stays are a 1 snap use...
I use OEM, and always carry a spare. It would likely be cheaper in the long run to have an after market model, but since I had the OEM one and picked up a spare slightly dinged used one for $20, that's the route I've chosen...