What If Mace Windu would kill Palpatine?
the Jedi Order would have never been wiped out and would have gained trust for Anakin. Also, Obi-Wan would still be Anakin's Master and Padmé may have also lived and remained in Anakin's life.
Luke Skywalker would be trained by Anakin Skywalker of the art of Jedi knights.
Bail Organa would be elected to lead the Republic.
With the death of Darth Sidious, Count Dooku, and General Grievous, the core military structure of the Separatist Alliance would likely collapse, and the war effort on the CIS's side would soon fall apart. While there were remaining members of the Separatist leadership (e.g. Nute Gunray), it is most likely that the tides of the Clone Wars would rapidly turn into victory of Republic. And if Darth Maul survived, he would be main character of dark side. Darth Maul trained a lot with his lightsaber and also worked on power control, so he returns as one of the strongest in the universe. There would be new Darth Vader but no Anakin, it would be some of siths,. He wouldn't be too powerful as Anakin, And wouldn't have army, cause of fall of Dark Side.
