Suggested by iKnowledge Darth Traya is a powerful Sith lord/Jedi Master who has a ton of solid Force techniques. Perhaps Rey will be able to catch up to her at some point, but Traya is so experienced in the force that she could use 3 lightsabers at the same time. Rey would be completely overwhelmed by this level of ability and her inexperience in the Force would show. Darth Traya wins.
DReager1.com 
Let’s see how Rey fares in the Rise of Skywalker before the verdict is changed.
Yes, in theory her abilities should have gone way higher by now. It’ll be tough for her to match a Sift lord though