Uchiha Barles... nice argument.

I would still think it is Jiraiya... Oro was just on weed when he fought Jiraiya and said he was stronger....

Well to be honest its between Itachi and Jiraiya in my opinion. Jiraiya attacked Itachi, and Itachi ran. That can either be seen as a sign of weakness, or strength if you consider it to be a tactical move.

So I guess based on the anime... I'm un-decided.