I really don't see anything attractive about Sabine...her looks rather turn me off. Vicki is ok to look at, but not very hot IMO. And I could care less if Sabine can drive fast around one track - I think it would be more interesting to pit them against each other on a track that neither of them has been on before. Sabine's no slouch, but we haven't seen her other than at the Nurb.
I chose Vicki btw, 'cause I think she looks marginally better, and I still think Sabine is too proud of what she can do at the 'Ring.