to be honest mate id just got the BBS VK done in paint then stupidly curbed them and it made me feel sick. i was so disappointed.
i see what youre saying about chipping, that is true, but i couldnt take it anyway if theyre curbed i HAVE to get them re-done. maybe a bit OCD but hey, im ok with it!
i almost went up a curb in my VMRs today then after realising parked round the corner.
Paint is more durable, but i think powder coat has a better finish.
also depends on the paint and the colour etc i suppose for touch ups. you would have to talk with the person doing it to see if it could be done or not depending on colour etc.