I saw you also posted on the KR spinning forums - I think you'll get a better response there. I don't have any experience with either wheel. One thought, though. If you buy a new Fricke, it will probably have a warranty and you'll get support, if you need it, from the maker. Not so with the used Kromski.
Chances are good with either wheel that if you really hate it, you can sell it for near what you paid for it.