Huh. When I had to do this recently, I used NFKD. I guess from codepage 1250 there's no difference between the two, but for codepage 1252, there is - NFKD squashes superscripted 2s and 3s to regular 2s and 3s, and changes "½" to "1/2".

Of course, whether or not such a squashing is desireable will depend on the application.