1st Hokage: He would win, his wood release was very powerful and its likely he could puncture a hole through the 3rd raikage's scar. Also he could heal himself and use earth and water release.
2nd Hokage: Arguably the most powerful water release user in the series. We have seen water style techniques that would split rocks in half like a laser. He could also use the most complex water style technique with one hand sign. He also has impure resurrection and his space time jutsu as well if things get rough.
3rd Hokage: The most powerful of the hokages in his prime. Its stated he was the most powerful hokage in his era, that him and enma were an unstoppable duo, and for knowing all of konoha's techniques(excluding KG). His Adamant staff that enma transformed into is strong enough to withstand wood release thus making it a powerful weapon, hiruzen also was very good in hand to hand combat, fighting off both hokages simultaneously while placing explosive tags on them without them noticing. Not to mention he has earth release and can mix the two elements together(not a KG but merely using earth release and mixing a fire release in it like jiraiya and gamabunta).
4th Hokage: Minato is one of the most gifted shinobi in history, he has FTG and rasengan. I'm sure he could figure out a weakness for getting through his Raiton armour. However in my personal opinion, minato is probably more likely to lose the fight.
5th Hokage: Easily wins the fight. Both her and the third raikage are very similar. The Raikage has more speed, but tsunade has immortality + strength that far exceeds the 4th raikages(according to Madara Uchiha). If she were too punch him I would imagine he would take damage. She punched Madara and split him pretty much in half, punched through a susanoo, hell she ruptured the ground with just one finger. She wins the fight mid difficulty, plus she has the slug that can cover her and heal her + provide considerable defense as she was not burned or even injured by the corrosive chakra that was coming from the kyuubi during pains invasion.
