I wouldn't exactly say they were even... even though Obi-Wan held his own, there are some scenes that show the superiority of Anakin - him holding with one hand against Obi's two, him repeatedly managing to kick and almost strangle Obi-Wan, and of course his monumental jump from the lava fall - when Anakin says "This is the end for you, my master.", you can IMHO see in Obi-Wan's face that he thinks so too.
Anakin had a reason to be arrogant - yet it still caused his downfall.
I find it cooler that Anakin loses despite his greater physical power - it's a nice analogy to the general Jedi-Sith relation. Although the Sith momentarily achieve more than the jedi, the light triumphs in the end