not so much a durability issue but i reckon you get a better finish with paint i.e shine & depth {fair enough not with satin} + there.s more quality painters around than powder coaters
I understand what your saying but my main concern with the finish on wheels is how will it stand up to tyre changes, stone chips and cleaning and with a decent aplicator powder does come up almost as good as paint.
suppose it depends on what u want my carbon seats not as durable as the original but looks that bit better a good quality lacquer is well up to the job my old arse6 wheels lasted 4 year of track /work/thrash & i still got the little xtra bling factor
powder without a doubt, had a set of my marvics painted in 2 pack and was chipped in one season. so powder for me from now on. just make sure you get them blasted yourself. which was easy for me cos own a sand blasting company.