Pre-suit Vader.
Character battles

Vader before reconstruction is just anakin
Vader before reconstruction is nightfall vader

Revan is just OP but isn't he non-canon, if he is, Revan, non-canon characters are either op or worse than the ocean-

In comics Vader takes on an entire rebel army single handedly, and that is beside the point. Vader never sees his full potential so the Revan seen in certain comics and the end of KOTR is more powerful than any Vader incarnation seen.
However, Vader's potential is infinite because he is the chosen one. I do not count any Disney BS about Rey.
Even though Vader never reached his full potential, Luke, who has the same potential as Vader does reach his potential in his final fight with Aboleth. Vader could have reached that same level if Palpatine had not stunted his growth.
Hence, Vader at his full potential could obliterate anyone if he actually reached his peak except for Luke.
Who would win Darth vader At full potential or Darth revan