Darth Vader Vs Darth Sidious (rotj, saber only)
we all know that sidious could take vader down in a real face off, but if they were somehow limited to saber only whod take it. sidious is supposedly on par with yoda (level 9 if you listen to nick gillard), but hes gotten old, and possibly hasnt touched a saber since he wiped out the jedi in rots. vader on the other hand has taken out a number of jedi since then and kept up his saber skills to a high degree. who takes it?