I've tried both Penny's recipe and the NFSC recipe... did a blind taste test with over 12 people, iced and plain. Some preferred the NF, some Pennys. There wasn't a clear consensus, and almost half of the testers couldn't' tell the difference (especially with icing).
I go with the NF as my standard recipe, because it is so easy to work with and because it cuts out the expense of some of the ingredients (like the cream).