Third Hokage no doubt 😀
third raikage, i doubt that hiruzen has anything that could be destructive enough against the lightning-armor :)
From what we've actually seen from the 2, I'd say the Third Raikage wins this but then again, Hiruzen has so much unseen hype backing him.
as far as cold hard feats -raikage wins. but as far as hype,theory and hearsay ,hiruzen supposedly wins. though hiruzen has the OP reaper death seal, but if its possible to physically dodge the technique,raikage could do it given his speed
Raikage would win unless someone comes out with some feats for Hiruzen. As people have pointed out, the only thing going for the Hokage is hype.