Canon.
Ahsoka Had the Highest Kill Count of the Clone Wars
Jedi Padawan Barriss Offee, however, was also with her, giving her roughly the same kill count.
General Grievous was among the greatest and most feared Jedi hunters, personally killing numerous Jedi in lightsaber combat during the course of the Clone Wars. He was notable as a rare example of a non-Force sensitive being who nevertheless could hold his own against the Jedi in lightsaber combat.
1 Darth Sidious
There has been no Sith, as powerful, meticulous, nor as evil as the Emperor himself, Darth Sidious. As previously mentioned, Sidious trained in the Dark Side by Darth Plagueis before Sidious killed Plagueis in his sleep, making Sidious a Sith Master.
Jedi swordmasters
Obi-Wan Kenobi was considered to be one of the greatest Jedi swordsmen of all time. A practitioner of Form III: Soresu, Kenobi was considered the greatest master of the form ever, just as Count Dooku was considered the greatest Makashi practitioner ever.
Over a thousand Jedi perished in these battles. Hord was a fearsome master of the dark side.
Due to his abandonment during battle, Hock hated the Jedi. During the Clone Wars, he had considered them to be fearless warriors, but believed others could be fearless even without a lightsaber, and that even Jedi could make mistakes.
Koon was shot down in his Delta-7 Aethersprite-class light interceptor by clone pilot Jag, perishing as his fighter exploded and crashed.
During the Battle of Endor in 4 ABY, Sidious was killed by a redeemed Anakin Skywalker, who turned back to the light side of the Force and threw Sidious down a reactor shaft to save his son Luke Skywalker.
Star Wars: Episode III – Revenge of the Sith - Tyranus is killed by Jedi Knight Anakin Skywalker, who later turns to the dark side and becomes Sidious' third apprentice, Darth Vader.
It is Canon sidious was the most powerful sith to his Day. It is Canon yoda was the most powerful jedi to his Day ( both later bested by luke). It is Canon sidious = yoda (yoda was not in his prime in the battle). This is statet by George Lucas himself.
If we're to come to a definitive decision on who the strongest Jedi ever is then we have to consider more than their physical skills and strength. Master Windu could be the strongest Jedi ever, he's strong, trained, wise and proved his abilities in combat as well on the Jedi council.
Yoda. Yoda was a wise, experienced, and powerful Grand Master of the Jedi of an unknown species and the oldest known prophet in existence (having lived at least 900 years), considered the wisest and most powerful Jedi Master within the Star Wars universe.
CC-1004 made his first canonical appearance in the 2005 film Star Wars: Episode III Revenge of the Sith, where he was voiced by Temuera Morrison, who voiced all of the other clone troopers in the movie. Like all of the other clones, he was portrayed as a computer-generated character.
Jedi Master Yoda and three clone troopers -- Jek, Thire, and Rys -- must face off against Count Dooku's dreaded assassin Ventress and her massive droid army to prove the Jedi are strong enough to protect a strategic planet and forge a treaty for the Republic.
#1 – Yoda. Yoda is widely considered to be the greatest Jedi of all time, and with good reason. He is a master of the Force, a skilled warrior, and has an unmatched wisdom that comes from centuries of experience.
A Sith Lord with the ability to prevent death and create life, Plagueis is the mentor of Sheev Palpatine/Darth Sidious, who, in accordance to the Sith's Rule of Two, eventually betrays Plagueis by murdering him in his sleep, taking his place as Sith Master.
Darth Sidious was able to cheat his upcoming death by transferring his spirit into a clone body while falling into the reactor core of the second Death Star. He later sought to prolong his existence by futilely manipulating his grandchild Rey into killing him so he could live further by possessing her body.
Requesting that Githany secretly teach him Force techniques she learned from the masters, Bane also began private lightsaber combat instruction with Kas'im.
Qui-Gon Jinn was one of the most powerful Jedi Masters, but he was often subversive, and his ideas and methods were controversial among the Jedi elite.
Rey's lightsaber was a yellow-bladed lightsaber that was constructed by the Jedi Rey Skywalker following the First Order-Resistance War.