Answer: Obi-Wan is one of the most popular Jedi ever, his fame gives him the high ground a lot of times.
In the Star Wars Legends continuity, the founders of the Jedi Order were Jedi Masters Cala Brin, Garon Jard, Rajivari, and Ters Sendon.
There just isn't any way that in an even fight Obi-Wan beats Vader. Although Vader is supposed to be one of the strongest force users of all time, we actually haven't had a chance to see him using his full strength very often.
1/10 Luke Skywalker
The greatest of the Skywalkers, the savior of the Rebellion, the redeemer of Darth Vader and the man who indirectly was the cause for the demise of the Emperor, Luke Skywalker actually gave his real contribution to the galaxy after he achieved the glorious victory depicted in the films.
Mace Windu lead 212 Jedi to the Battle of Genosis and killed the infamous bounty hunter Jango Fett. He was a High Jedi General and considered to be the best Jedi Lightsaber wielder ever.
1. Darth Sidious (Star Wars: Episode I – The Phantom Menace) Truly, the most powerful Sith Lord was Darth Sidious, better known in his public persona of Chancellor (later Emperor) Palpatine. Through cunning and manipulation, Sidious killed his master to claim the mantle of Dark Lord of the Sith.
The legendary Obi-Wan Kenobi is considered one of the strongest Jedi ever to carry a lightsaber. He took down Darth Maul twice, defeated the infamous General Grievous in one-on-one combat, and bested his former apprentice Anakin Skywalker in the fateful duel on Mustafar.
Anakin is more powerful than his son because he is the direct descendant of the force, while Luke is the son of the descendant.
In Star Wars Legends and Canon, Galen Marek (Starkiller) is the only Jedi (other than Obi-Wan Kenobi) to put a beat down on Darth Vader/Anakin Skywalker. Galen was secretly trained as a Sith Lord apprentice to Vader, but returned to the light side and the Jedi.
The duel. Darth Vader defeats Darth Maul. The two Sith Lords engaged in a lightsaber duel, going through the volcano and onto a bridge situated over a river of lava, which collapsed, though they both survived and continued their battle.
Vader held respect for Tarkin which is clearly shown and the only case in which Tarkin outranked Vader would be the case in which Vader was in the Death Star or within Tarkin's Oversector which he likely was as Tarkin was Grand Moff of the Outer Rim Oversector, the largest one.
Vernestra was enough of a prodigy that she eventually attained the rank of Jedi Knight at the age of only fifteen, making her the youngest Knight in a generation.
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Vern is a newly-minted Jedi Knight. Vernestra, Mirialan, was Padawan to Stellan Gios. She works hard and is devoted to the Jedi Order, more so than most others her age. At sixteen she is one of the youngest Knights in a generation.
Darth Vader is the rockstar of Star Wars baddies, ever since he first appeared in A New Hope. He represents the power of the dark side for generations of fans, but his legacy continues on in the Star Wars galaxy as well.
Villains like Kylo Ren and Darth Vader sometimes feel the pull to the light, but Darth Sidious, also known as Emperor Palpatine, is the embodiment of pure evil. Portrayed by Ian McDiaarmid in the original, prequel and sequel trilogies, he is the ultimate big bad of the Star Wars universe.
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.