Arguably, Qui-Gon is wiser in some ways, given that he knows how to preserve his consciousness in death. Yoda is wise, but sometimes flawed, given that some of his views align with the problematic thinking of the Jedi of this era.
It is fair to assume that the Jedi Master Yoda is the wisest of all Jedi that we have ever met, and perhaps this is true. Still, there may be one who was even wiser: the Jedi Master Qui-Gon Jinn. Though he was never on the Jedi Council, he was always held in high regard for his unique understanding of the Force.
Yoda is often thought of as the wise one, but he played a big part in the recklessness that led to the end of the Jedi order.
Qui-Gon is shown to have a much deeper knowledge of the cosmic Force than every other Jedi. Qui-Gon Jinn was the first to become a Force ghost, even teaching Jedi Grand Master Yoda how to do the same in the last arc of the incomplete Star Wars: The Clone Wars season 6.
Though Yoda and Qui-Gon respected each other, they were often at odds due to their differing beliefs; Yoda looked to the future while Qui-Gon lived in the moment. After Qui-Gon was killed by Darth Maul, Yoda was saddened, but continued to disapprove of Qui-Gon's unorthodox ways, regarding them as "defiance".
Why Qui-Gon Jinn Was Palpatine's Greatest Threat. Unlike Yoda and the Jedi High Council, Qui-Gon Jinn was only concerned about the will of the Force. Therefore, Palpatine needed Qui-Gonn out of the way because he was better connected to the Force than the other Jedi.
Palpatine admits to Darth Vader that the Jedi he actually feared most was none other than Jocasta Nu.
But one Jedi stands above the rest and needs to start getting recognized as the greatest Jedi who ever lived. That is none other than Obi-Wan Kenobi. While this saga is ultimately the story of the Skywalkers, Obi-Wan is arguably the best and most pure Jedi to ever come out of it.
While little is known about Yoda's species, we do know, however, that their entire race is incredibly gifted in the force. Both Jedi Master Yaddle, and now Grogu hold great force powers, but no Jedi Master has ever held greater power than Jedi Master Yoda.
As powerful as Darth Sidious may have been, it's easy to forget he actually seemed afraid of Master Yoda.
The reason why Qui-Gon Jinn is the most powerful Jedi in the galaxy is because he had seen everything that would unfold throughout the Skywalker Saga in a vision of the future, sacrificing himself to ensure the fulfilling of the Chosen One prophecy.
Qui-Gon was ultimately defeated by a move that can only be done with a double-bladed lightsaber as Darth Maul used the handle of the weapon, striking Qui-Gon physically on the chin, stunning him for just long enough to deliver the killing blow.
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.
Few Jedi were permitted to perform Morichro. Flow-Walking — Rare power that allows user to enter the past, alter it, and change the course of the future. Force Walk — With immense strength of will, a Sith could bind restless Sith ghosts to themselves, siphoning power.
Qui-Gon Jinn learned to manifest as a Force ghost after death, thus allowing him to retain his consciousness in the Force. Several other Jedi also achieved the same ability, most notably Obi-Wan Kenobi, Yoda and the redeemed Anakin Skywalker.
In non-canon material it is said that Palpatine had a number of concubines and never took a wife in fear that he would produce a legitimate heir. One of these non-canon concubines was Roganda Ismaren, a former Jedi who survived Order 66, and lived for a time at Palpatine's side.
Even after his brutal scorching in the fires of Mustafar, sand remained the only natural phenomenon that Vader feared. To him, sand was a reminder that he'd failed to save his mother or Padme from death.