Roan Fel has no business trying to beat later Obi-Wan incarnations. TCW Obi-Wan is vague as Zoltan said, however Ventress admits in the TCW junior novel that Obi-Wan was more powerful than Anakin, so as someone who sits above post-AotC Anakin, I'm inclined to side with Obi-Wan over Fel.
As for AotC Obi-Wan, I'm not too sure, since it's pretty hard to judge where he is. That said, AotC does take place mere weeks before the TCW movie, by which time Obi-Wan > post-AotC Anakin, so he probably beats Roan Fel then as well.
I knew you wouldn't be able to resist the opportunity to suck on Obi-Wan's dick.
Angry now, Ventress activated her lightsabers. She turned to see a bearded Jedi standing in the doorway. She sneered."Master Kenobi. Always chasing after Skywalker. How predictable. "
Obi-Wan steeled himself at the sight of the assassin. He had faced her before, and although she had never been formally trained as a Sith, her command of the dark side of the Force was strong.
"Anakin leaves quite a mess, " he replied. "Which always leads me to you, Ventress. "
"Take him!" Ventress ordered the super battle droids.
She ran for a side exit. Anakin Skywalker was a powerful Jedi, but she knew Obi-Wan was even stronger.
-- TCW Junior Novelization