Board Thread:Versus Debates/@comment-26005711-20150512133037/@comment-4061125-20150728052438

QuakingStar wrote: With Hiruzen, his prime was never shown because story-wise there was no place to show it and no need to. Third God of Shinobi.. the Professor.. the Strongest Hokage and Strongest Kage of his Generation. All names he earned. Kishi decided Prime Hiruzen was top notch and that's all we can go with because we were not shown Prime Hiruzen fighting.

You're right, so I guess if Hiruzen is in his prime, he wins, and if he isn't in his prime, Tobirama wins? At least according to Kishimoto's word. Besides that, there really isn't any way to tell since we haven't seen the full power of either of them.