Originally posted by Darth_Janus
That doesn't mean a thing... But anyways, Mace has been a master longer than Obi-Wan... his Force mastery is doubtlessly greater. ANd besides, the real factor here is lightsaber combat. Obi-Wan had pretty much mastered form III by ROTS. However, it was not enough to allow him to get the advantage of Dooku in the beginning. The only reason Obi-Wan won against Grievous was because the general pushed the attack. And Anakin was defeated using pure defense. Now, Mace Windu (WHOSE VAAPAD STYLE IS NOT STRONG AGAINST DARK SIDERS... GET THAT OUT OF YOUR HEADS) has to master several styles in order to refine and create the final installment of Juyo. Meaning? He is not just keen on defense (And having a blaster bolt reflection technique similar to Form III) he has a superior offense, something Obi-Wan does not possess. In the end? Obi-Wan will tire himself out and Mace will defeat him, bar some unforseen accident. Odds in favor of Mace. Mace wins.
Obi-Wan used form IV against Anakin in ROTS not form III.
Form IV: Ataru
The master practitioners of Form IV make extensive use of acrobatic maneuvers often thought not physically possible. This form was created during the last centuries of the Old Republic. Qui-Gon Jinn and Yoda were both masters of Form IV, as shown in their duels against Darth Maul and Count Dooku, respectively. Obi-Wan Kenobi, though already very advanced, abandoned his Ataru training in favor of Form III because he felt that his master's death demonstrated a fatal flaw in the defensive capabilities of this form, nevertheless Kenobi applied Ataru acrobatics to face the Sith Lords Darth Tyranus and Darth Vader in Revenge of the Sith. Aayla Secura is also a master of Ataru, according to Jan Duursema, who co-created the Twi'lek Jedi; Quinlan Vos had taught Aayla Form IV. Palpatine used a Sith variant of this form, which included stabs and wide swings. Cin Drallig might have used this form against Anakin in the Revenge of the Sith Video Game.
In dire situations, Form IV practitioners use the Force to aid in their acrobatics. Spinning, jumping and running very fast and very high, masters of Form IV are sometimes only seen as a blur. In order to achieve the acrobatic prowess, amazing reflexes and physical punch of this form, a Jedi Master would focus on the Force, letting it flow deeply throughout his entire physicality, even allowing him to overcome the limitations of old age. Due to its aggressive nature, it is an effective form to use against single enemies; however, it leaves the user open to attacks from multiple opponents; therefore, it is wise to use Ataru in a duel, but not in open warfare. Jedi Master Yoda used this technique in almost all of his battles, due to his incredible connection to the force.