Well, looking at the 70+ different FFF parts i printed in the last year, i'd say maybe 5, max 10 had support material. But with SLS i would have to clean each one of them. So...more post-processing with SLS in general.
But the finish is better with SLS i guess, compared to FFF. But maybe not that much better than DLP ? Which is my next printer i'm receiving in November (and no powder to remove, maybe a quick alcohol wipe).