Who do you think is stronger Oonoki vs Hiruzen Sarutobi
Hiruzen Sarutobi:
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 and was said to be the strongest Hokage that Konoha ever had. Even in his old age, he also said to be the strongest of all the five Kage at the time of his death. 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. He was also called "The Professor" due to his mastery of all forms of shinobi combat, and his vast knowledge of techniques, purportedly knowing all the techniques within Konoha.
Oonoki:
Oonoki is a powerful and capable Tsuchikage. However, his skills are often hindered in battle due to his bad back resulting from his old age, and as such he isn't suited for taijutsu. Oonoki is quite analytic in combat, and even stated that he normally feels a potential opponent out first before engaging in direct combat. When he first encountered Kabuto Yakushi, he intentionally attacked him with a light punch to test to see if he was Madara Uchiha. In the event that Kabuto was a trap he had already prepared a clone decoy. During the Fourth Shinobi World War, he suggested to begin the assault on the enemy with long-range techniques, and then observe the enemies response to attacks. Oonoki has a great deal of experience, having fought Madara Uchiha and survived, thus his knowledge is invaluable to the Allied Shinobi Forces. Because of his ability to rally his comrades to fight on despite the odds as well as his years of experience and battle knowledge as well as ninjutsu prowess, Madara considered Oonoki a great threat to him on the battlefield.
My opinion:
I think Hiruzen is stronger then Oonoki, I don't know how to explain why sorry.
All of these information about Hiruzen and Oonoki come from Naruto wiki.
Hiruzen Sarutobi:
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 and was said to be the strongest Hokage that Konoha ever had. Even in his old age, he also said to be the strongest of all the five Kage at the time of his death. 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. He was also called "The Professor" due to his mastery of all forms of shinobi combat, and his vast knowledge of techniques, purportedly knowing all the techniques within Konoha.
Oonoki:
Oonoki is a powerful and capable Tsuchikage. However, his skills are often hindered in battle due to his bad back resulting from his old age, and as such he isn't suited for taijutsu. Oonoki is quite analytic in combat, and even stated that he normally feels a potential opponent out first before engaging in direct combat. When he first encountered Kabuto Yakushi, he intentionally attacked him with a light punch to test to see if he was Madara Uchiha. In the event that Kabuto was a trap he had already prepared a clone decoy. During the Fourth Shinobi World War, he suggested to begin the assault on the enemy with long-range techniques, and then observe the enemies response to attacks. Oonoki has a great deal of experience, having fought Madara Uchiha and survived, thus his knowledge is invaluable to the Allied Shinobi Forces. Because of his ability to rally his comrades to fight on despite the odds as well as his years of experience and battle knowledge as well as ninjutsu prowess, Madara considered Oonoki a great threat to him on the battlefield.
My opinion:
I think Hiruzen is stronger then Oonoki, I don't know how to explain why sorry.
All of these information about Hiruzen and Oonoki come from Naruto wiki.