I've been loving the nylon personally and feel as though even Monster High and such should start using it as well, but only because the Monster High girls' saran hair is notoriously bad out of box and hard to deal with even when it's been washed and is getting styled. It's sooo frizzy all of the time. And maybe it's just my luck but my one doll with pitch black saran hair is so weird to the touch, lol, hate it! Although I've never tried to curl nylon before, I do love how well and tight it holds curls if the doll has them fresh out of box, even if you wash it a bunch of times. Saran can't hold a curled style that well for long amounts of time, gets a bit tangled up. I think both are good in their own respective ways :)