Darth_Glentract
The Truest Sith Lord
Luke. He had (contrary to popular belief) several months of training as a Jedi. He had fought Darth Vader on some weird planet, and survived because of the Kyber crystal. It is also not impossible to train yourself. Where were the first jedi trained? Luke wins. The Kyber crystal enhanced his connection to the force which allowed him to actually cut off Vader mechanical arm in a battle( he did have help from Leia though).
Obi-wan may have killed Obi-wan but he did barely any of the work. Qui-gon did practically everything. I also think that Obi-wan was in a crazy force faze after seeing him Master killed. (Something similar would be when Anakin Solo became one with the force for a few minutes before he died and killed hundreds of Yuuzhan Vong and the Queen Jedi Killer. His brother Jacen also reached this during the attack on Shimera's palace, but he, unlike his brother survived.
Does anyone think that Obi-wan never taught Luke when he was a Force Ghost? Seems very likely to me that he did because he knew he would need the training. That could be three years of training by Obi-wan by ESB.
All of the following times assume that the fighters kept fighting after the seen changed to a different location.
Qui-gon and Obi-wan vs. Darth Maul
Qui-gon and Obi-wan, 251 seconds
Qui-gon by himself, 71 seconds
Obi-wan by himself, 37 seconds
Luke vs. Darth Vader
Luke by himself, 356 seconds
This is not counting the fight in Splinter of the Minds Eye.(mainly because I thought that fight was dumb anyway.)
I personally think that Darth Vader is the stronger Sith Lord, and Luke fought him longer than Obi-wan did by himself.
All of the following times assume that the fighters kept fighting after the seen changed to a different location.
Conclusion.
Luke managed to hold out against a stronger Sith Lord longer than Obi-wan. This just shows more skill and capability.