-Killed countless Jedi
-Brought down a cathedral with the Force
-Fought evenly with Galen Marek
-Was stated to be 80% of Darth Sidious's power
-Defeated an elder Obi-Wan Kenobi
Mace's feats:
-Was considered to be on par with Count Dooku and Yoda as a duelist
-Destroyed armies of droids with the Force
-Was stated to be the 2nd greatest PT Jedi
-Defeated Darth Sidious
-Stalemated Boba Fett
Either Mace is able to resist Vader's Force powers and wins after difficult saber fights or Vader takes the better of him with his TK and strong lightsaber strikes.
Mace wins large majority. But Vader will take a minority by getting a Force Choke on him.
And no I'm not underestimating Mace's force abilities. But the fact is Vader has gotten even Starkiller in a force choke (yes he took him by surprise, but still it's frigging Starkiller).
And Vader vs Galen's final fight had them both reaching for each other's throats with the Force while locked in Saber combat. So that IS what Vader will be attempting to do to Mace while desperately defending himself in Lightsaber combat.
You misunderstand. I am not underestimating Mace, but rather, giving Vader the credit he deserves. He was, quite literally, a TK God.
During the novel Bounty Hunter Wars, Vader(who was near Coruscant) began force-choking Xizor(who was near Tatooine.) As you can see by this map of the Star Wars galaxy, the aforementioned planets are literally half a galaxy apart: http://i1180.photobucket.com/albums...zpsad75a0f1.jpg
This means Vader was able to extend his reach with the force across tens of thousands of light years(at the very least), in an extremely precise/fine-tuned manner. Also note that it was stated during the same scene that Vader was immensely holding back his full power, as to not show the Emperor what he was truly capable of.
Mace is certainly powerful with the force... Just not that powerful.
I think Vader's force abilities could give him an advantage over Windu, but his lack of mobility could be devastating against such an aggressive opponent. Speed might be the deciding factor here, especially if Windu's shatterpoint immediately picks up on Vader's weakness.
His saber skills are not underestimated, Windu's abilities have made him on par with Sidious with sabers. Obviously he would not get as much as a boost form fighting Anakin but Mace has the definite advantage in sabers.
What decides the battle is whether or not Mace has the force powers to contend with Vader. Seeing as Mace didn't go down easy to Sids I'd say Mace wins.
Is that a joke? People try to rank him above ROTS Anakin in spite of it being stated by numerous canon sources that ROTS is peak Anakin, after that he just declines in power.
OT Vader is strong as shit, but I doubt he'll be able to parry 24 blows per second, not when the person dishing it out has Shatterpoint, and certainly not against the master of Form VII.