As tough as the alien hunter is, I don’t think Ridley is ready to take on Ripley. Ripley has dealt with aliens that were much fiercer than Ridley’s versions and Ripley also knows how to use a gun when in a tight situation. Having a gun is a significant advantage when both fighters are only human. There’s no way that Ridley can even land a hit here since one shot is all that Ripley needs. Ripley wins.