In terms of sexiness, they were about on the same level for me, with Nena possibly having a very slight edge. There was no contest going on, but I guess that's just the way my brain was perceiving things. There was a lot to process for hormone-driven males.
UWE's EDIT:Michael in all his innocence was led astray by me, this belongs to the "I can relate"-thread and can be found there now as well.