(Boy, I really hate myself when I do this....)
The premise of the question (as I read it) is that the two beings 'abducted' from a "Hollywood party" were the ACTRESSES (Ryan & Weaver). If so, there's no "7of9" with alien DNA/implants and "Ripley" is human (not the movie character who's got some Alien in her makeup somewhere.)
So the question is (really) "Who'd win a catfight Jeri Ryan or Sigourney Weaver?" (and why not have those super alien abductors travel thru time to abduct each one at their physical peak, while we're at it?) Now THAT would be a fight worthy of a trip to a space station orbiting an alien planet!!
(BTW: in keeping with MY OWN interpretation of what I think the question should have been, I voted for Sigourney Weaver - at her physical peak, not that there's anything wrong with Ryan winning. I just can't wait to read either story .... or better yet, why not BOTH stories!!!?)