Board Thread:Theories and Speculation/@comment-26379028-20150606210145/@comment-2140588-20150607175128

hmmm... It depends on whether Tobirama could surpass the Third Raikage in speed (using his Space-Time Ninjutsu that is). Whoever deals the first blow would most likely be the winner. Also, Tobirama has the ability to use all five natures, so he could counterattack any nature-themed technique A would throw his way.

Though, taijutsu wise, I doubt that Tobirama would be the winner in that category.

We don't know a full extent of both of their abilities. Also, a different terrain would be beneficial to either of them. But for the sake of everything (xD) I would say that Tobirama would win.