Silver Back Gorilla
The grizzly would obviously win. They are much bigger and stronger. Grizzly bears are meat eaters which means they are more suited for fighting rather than the gorilla which is a plant eater. Grizzlies are overall better than gorillas especially when it comes to fighting.
In all seriousness, the gorilla is too weak when pinned up against a grizzly bear. The bear is very muscular, as indicated from the giant "hump" of muscle on its back as well as thick legs, arms, and chest. The bear has thick fur and fat to aid in blocking bites and slaps from the gorilla. In addition to good protection, a single swipe from a bear can kill many animals including mountain lion and wolves. http://www.animalfactsencyclopedia.com/Grizzly-bear-facts.html
Bearz wood beet a dum borilla aniday. bars are butter then monkees. ef u dissergree, i wall call my ber scwadren in to kill u
One right hit to the head would kill the bear.
The reason the Silver Back Gorilla would win is because it is stronger, can hit faster than a bear, and the bear may have fat and muscle but i don't know if you've ever seen a gorilla fight another gorilla. The point is that the gorilla will win in a fight to the death with a grizzly bear
Gorilla's have a much greater hand win it comes to strength and mobility.
They are smarter so they would probably out-wit the bear. The gorilla would probably get on the back of the bear and snap its neck.