Darth Zannah (DoE) vs Darth Vader (RotJ)

They duel in the Valley of the Sith Lords.

Vader has better force feats to close the fight but the sorcery could push it in Zannahs favor if she uses it at the start.

Vader completely crushes.

Zannah tentacle-rapes.

Sith Sorcery FTW

Vader hands down.