Minato is stronger. Let's not forget the one we compare in the manga lacks an arm, so practically all his ninjutsu is restricted. He still has superior FTG confirmed again
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,
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, their speed to act is comparable
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. Minato has more variants
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, in terms of defensive ninjutsu
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Concerning the elemental recomposition,
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, only that with the lack of an arm like i've previously mentioned, he can't even perform handseals. On the other side, Tobirama has suiton jutsus.
But besides this, Minato still has
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(rasengan),
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, like contract seal(that stops someone in summoning a creature or controlling it), Shiki fujin(sealing the strongest tailed beast), Shishou or Hakke fuin and so on
We've also yet to see his rasen chourinbu kousan shiki if Kishi really intends to show it, something i still believe he will(i think Minato can't atm because the technique probably requires handseals)