ROTS Anakin versus ROTS Obi-Wan
Before you guys go nuts and call me a stupid n00b, here me out.
Is it not possible that Obi-Wan had a large advantage over Anakin, in that Anakin had nearly completely exhausted himself? Keep in mind that in the space of less then 24 hours, Anakin had wiped out the Jedi order, destroyed the seperatists, and had a complete fall from grace.
Now, while some of you might say that No, his adrenaline was pumping and he was full of the Darkside, is it not possible that during the time between the seperatists being wiped out and his choking of Padme ,causing yet MORE emotional anguish and making him not think straight (more on this later), his adrenaline levels decreased and fatigue set in?
Also, prior to the Obi-Wan/Anakin fight, the emotional anguish of having not ONE, but TWO of his closest companions (Obi-Wan and Padme) "betray" him would likely cause him to act in a non-thinking manner, for instance, force jumping onto high ground.
So, in conclusion, had Anakin not undergone such trauma, and had several hours of rest, or at least, time to recuperate as Obi-Wan had, could he have beat Obi-Wan?