Minato wins.
1- Third Kazekage's Magnet Release controls only the iron sand.
2- even without FTG, Minato's base speed is MUCH greater than even the other Hokages.
and since Sakura made it to Sasori by his speed Imagine what will Minato do to him. lol
Sasori was not even able to react against Sai's speed.
3- if Sasori used his 100 puppets, Minato can use the S/T barrier to teleport then to the sea or anywhere else and leave Sasori alone.
4- based on #1 even if Sasori can control the Kunai that will end be destroying the 3rd. + Minato can use them by his own hand
5- what will Sasori do if Minato summoned Gamabonta on him as he did to Kurama?
6- Minato can use his RM and there is nothing Sasori can do to scratch him. (not id he can do anything anyway)
Finally, it's already stated that the Hokages are the strongest edo.