Prequel Trilogy Jedi vs KotOR Era Jedi
Experience: The Jedi Knights of the Knights of the Old Republic are more experienced in intense and melee/lightsaber combat based off of all available sources. The Jedi being born and fighting in the Mandalorian Wars would have known, lived, and trained in war their entire life. From the origins of the original battles in the Beast Wars to the final battle over Rakata Prime, the galaxy has been consumed in approximately 45 years of continuous and brutal warfare. They were raised in this environment, and obviously would train under the Jedi to combat the Krath, Brotherhood, Terentatek, Mandalorians, or Sith respectively. Compare this kind of extensive training to the average Jedi Knight leading into the Clone Wars who never experienced such training since no one anticipated such a large scale war to take place. Hell, besides combat sparring with their other Jedi Knights which are not accurate representations of a individuals power, the Jedi haven't fought a dueling force like the Sith for about 1,000 years. Compare 45 years of continuous warfare to 3 years of continuous warfare and you will see the Jedi of Revan's era utterly outcasses that of Mace Windu's (9x more warfare experience possible). Canonical source and extra information is supplied in the quote below:
"From one end of the Knights of the Old Republic era to the other, the galaxy is constantly torn by wars, and times of peace seem more rare then times of conflict. Most of the heroes in a Knights of the Old Republic campaign will have experienced nearly a lifetime of war, and have likely felt the rippling effect of massive battles and horrific devastation. As such, the face of the galaxy is much different than in the classic era; the advent of the Clone Wars was a major event in the galaxy, while the Republic has already been weathered two major major wars by the time the Jedi Civil War begins. More then just affecting the heroes, the constant warfare plaguing the galaxy has changed the face of the planets and their populations irrecoverably. Most planets have militias and defense forces that are significantly more powerful than they would have in peacetime." --KotORCG
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Skill: Lightsaber prowess has a lot to do with experience and training. Dueling is a prime component of the galaxy's culture as of Revan's time, unlike the widespread pacifists seen in the Prequel Trilogy. The excess amount of individuals training and perfecting their skills with a blade requires the Jedi Order to do the same (but only better) in order to continue to being the dominant force of peace and protection in the known galaxy. This continual practice is interwoven with the frequent encounters with Dark Jedi and Mandalorians. In fact, sourcebooks state that a "large number of Jedi" during Revan's time "become experts in lightsaber and Force-related combat." This mastery with a blade is nearly impossible to achieve for the average Jedi Knight merely fighting battledroids as seen in the Clone Wars. Let's face it, fighting Mandalorians and Sith are going to make you a better warrior a lot quicker then a couple battledroids. I have yet to see a quote that considers an average Jedi Knight of the Prequel Trilogy highly skilled in any form of combat. Masters like Anakin Skywalker and Mace Windu are special for a reason. 😉 Below are additional sources that support my statements above, along with extra material added for some toppings:
"The many wars of this era compel large numbers of Jedi to become experts in lightsaber and Force-related combat. Some become masters on the battlefield; others become highly skilled duelists, able to battle dark Jedi and Sith in single combat." --KotORCG
"Throughout the history of the galaxy, dueling has seen many degrees of acceptability, militarily, legally, and socially. Some cultures or subcultures regard dueling as an honorable and civilized method of settling disputes, but others see dueling as barbaric. During the Knights of the Old Republic era, melee combat has resurged, forcing many to study dueling as a means to survive on the battlefield. In fact, dueling is allowed on more civilized worlds then gladiatorial combat, given the higher cultural status dueling enjoys. The melee duelist specializes in fighting a single opponent. The melee duelist selects a primary weapon of choice, studying and practicing maneuvers, feints, and tricks to perfection. Competitive duelists train with several types weapons because they may not know ahead of time which types of weapons will be used in a duel. Battlefield duelists expand their abilities to take on small groups because they cannot depend on the luxury of fighting a single opponent in the middle of a skirmish." --KotORCG
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Power: This part mostly focuses on the overall hype of the Order's power and strength. I understand Lucas has labeled the Prequel Trilogy as the "prime of the Jedi," but people must understand other facts alongside that. Note how George Lucas doesn't consider the EU canonical, and therefore would not take it into account when doing such a quote. If you listen to the context of the quote, he is specifically comparing the Prequel Trilogy to that of the Original Trilogy. He is not however comparing the Prequel Trilogy to all of the different eras of Star Wars that had powerful Jedi in them. Eras like Knights of the Old Republic or The Old Republic have been entirely war based, it is basically impossible for the Prequel Trilogy to be up with them as fast as Episode 1 where the only notable wars the Jedi have fought in before then was the Stark Hyperspace War. 🙄 And honestly, that quote is hilariously outdated (I believe said in 1998). In the time since then, entire eras of Jedi have been formed, all of which are fighting far more brutal and skilled opponents then that of battledroids: KotOR, TOR, LotF, and Legacy. As anticipated, new sources have seemingly retconed those ideas. Multiple sources state that the Jedi Order during Revan's time was the combat prime of the Jedi, which also makes the most logical sense given all the opponents they are constantly fighting. Suggesting the normal Jedi of the Prequel Trilogy being more powerful is simply illogical. Revan's era needs superior Jedi in order to fight a superior fighting force. Below are merely a handful of quotes praising the Knights of the Old Republic era:
"During this time, the Jedi Order is at the summit of its power and self-confidence... Knights of the Old Republic campaigns take place against a backdrop that captures everything that makes Star Wars unique. Even more so than in the Clone Wars, these are the days of the Jedi in their prime. They do battle with the evil Sith, and defend the galaxy against the Mandalorian hordes." --KotORCG
The many wars of this era compel large numbers of Jedi to become experts in lightsaber and Force-related combat. Some become masters on the battlefield; others become highly skilled duelists, able to battle dark Jedi and Sith in single combat." --KotORCG
"Long before the Galactic Civil War, an epic drama begins. Engage in this saga set in the Golden Age of the Republic - over 4,000 years before the first Star Wars film, when both Jedi and Sith number in the thousands. With the Galaxy reeling from a recent conflict with the Dark Lords, the ongoing battle between the Jedi and the Sith rages on. Your actions determine the outcome of this colossal galactic war - and your destiny as a Jedi." --KotOR
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Summary: Greater experience, skill, and power of the Knights of the Old Republic Jedi grants them an overall edge over the Prequel Trilogy Jedi. The Jedi of the Clone Wars simply don't have what is needed to go up against warriors who's life revolves around warfare. I don't see how it is possible an average Jedi Knight of the Clone Wars can come out on top more then vice-versa with these factors. Training to combat battledroids is not comparable to Dark Jedi and Mandalorians. Thank you for reading - May the Force be with you.