If you don’t know any tell me your fantasy match up instead and what type of fight- catfight, titfight, sexfight - and who you’d want to win!
Wonder Woman vs Supergirl. Classic brunette vs blonde (hairpulling rolling catfight) again.
For a backstory one of them has been flipped, by bribery, hypnosis, mind control and/or she has been drugged,, so that rather than being a superheroine she is a super-villain instead. That makes it a classic good girl vs bad girl catfight. Who is the good girl and who is the bad girl? I don't care, it could be either and I'd be happy either way..
Who'd I want to win? The bad girl dominates the good girl. Every time!! Regardless of who is who/what. The good girl refuses to submit though, no matter how hard her opponent pulls her hair and crushes her. Then in any rematch they could reverse roles.