Since Madara is the stongest Ninja right now and he said Hashi is the only person who can put up a fight to him by himself, then yeah Hashi is stronger then Minato. Even I hate to admit it
Minato can instantly get behind him whenever he want too, if he knows Hashirama can healhimself, so Minato has the best brain here and,
what can his healing jutsu do if he get his brain crush by Minato so tell me