Originally posted by Intrepid37
If we assume one becomes more powerful when turning to the dark side (Dooku, Yoda in Dark Rendezvous, Ahsoka could possible win.
Darkside users tend to think so, but lightside users normally disagree, and at the end of the day the performance of the two sides ends up fairly similar with training matters more. Though the initial change often does grant a small boost.
I don't think such a boost would matter enough here.