I pick Hokage. He had Edo Tensei, crazy water jutsus, and according to Minato was very skilled in Space-Time Ninjutsu. I don't know about you, but coming from Minato that has got to mean something. Tobirama was a badass sensor too, by placing two fingers on the ground the clam and the Mizukages locations are exposed.
My guess is that just like Suigetsu is able to join himself to any body of water around him Tobirama was able to do the same. But unlike suigetsu Tobirama is able to create water from nothing so it's possible that he could teleport to any place he created water.