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Read my post again, folks. Obi Wan killed Darth Maul, who'd previously killed Qui-Gon Jinn, a very accomplished Jedi. He then kills General Grievous, who'd killed multiple Jedis in the past. Finally, he goes toe to toe with Anakin, at a point when Anakin had already killed tons of Younglings as well as Mace Vindu. In this fight Obi-Wan pretty much dominates Anakin. Based on all this I say Obi-Wan.

Except Vader owned him on the first Death Star.

And Anakin boned Padme.