The hippo outweighs the gorilla 10:1 and has far more lethal natural weapons.
The internet loves the gorilla, but a hippo would destroy a silverback in any realistic scenario. The hippo outweighs the gorilla by roughly 3,000-3,600 pounds and has jaws that can bite the gorilla in half.
The gorilla's incredible grip strength and arm power are irrelevant against something this large and this armored. Even if the gorilla grabbed the hippo, it physically cannot generate enough force to hurt an animal with 2-inch-thick hide that weighs eight times as much. Meanwhile, a single bite from the hippo's 1,800 PSI jaws would be instantly fatal.
The gorilla is far more intelligent and could potentially use environmental objects as weapons. Its grip strength is enormous and it has dexterous hands. In theory, a gorilla could climb onto the hippo's back to avoid the jaws โ but this is grasping at straws against a 4,000-pound animal.
The hippo is 8-10 times heavier with the most powerful jaws of any land animal. Its hide is natural armor. It's the most aggressive large animal in Africa. The gorilla simply has no weapons that can threaten something this size.
The hippo wins with overwhelming ease. The gorilla's strength, while impressive for a primate, is inadequate against an animal that weighs nearly ten times as much and can bite through bone with minimal effort.
Silverback Gorilla also fights
Hippopotamus also fights