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Hiruzen: Hiruzen was one of the most powerful shinobi in history. In fact, he was so powerful that he was admired as the God of Shinobi in his prime.
According to Iruka, he was said to be the strongest Hokage that Konoha ever had as well as the strongest of all the five Kage during his era.
Enma commented on his battle with Orochimaru, saying that it was "miserable" compared to his prime, even though he had clearly been able to hold his own against Orochimaru and two former Hokage without losing his composure.
Even in his old age, his chakra was noted for being very strong, causing a dense effect on the atmosphere when released, furthermore, he was known for having immense reserves of chakra in his youth.
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Minato: According to Jiraiya, Minato was one of the most gifted shinobi who ever lived.
Anko Mitarashi, in discussion with the Third Hokage about Orochimaru's immense strength and his threat to the village, stated that she wished the Fourth had been alive to face him.
During the Third Great Shinobi War, flee-on-sight orders were given to enemy ninjas should they ever see him appear on the battlefield.
Minato was also capable of countering the Nine-Tails' attacks to the point Madara himself needed to step in to face him directly. After their battle, Madara commended Minato and stated he was worthy of the title of the Fourth Hokage.
His abilities were so far advanced that even the Fourth Raikage thought that no one would be able to surpass him.
The stage is above the Mount Hokage Rushmore for a battle to the death of Greatest Hokage.(NO REAPER DEATH SEAL)
All descriptions of abilities were from Naruto.wiki
I gotta go with God of Shinobi > Konoha's Yellow Flash
****Here come the Minato FTG Fan Boys