The silverback gorilla is 7 times stronger than the average adult man, 6 feet tall and 360 lbs pure muscle. It also has knige sharp teeth the size of a butterknife. The brown bear is around 750 lbs, much stronger than the gorilla with more claws and teeth but much less agile and much slower. To clarify: By brown bear i mean a big male grizzly bear. A kodiak bear would almost definetly win but this is just a grizzly.