Silverback Gorilla Vs a Lion, who wins, and why?

These animals would probably never fight in nature, and if they met, I’m sure they’d just avoid each other. But lets say hypothetically they were in a cage match to the death, who would win?

Both are full grown male animals. This question was sparked from a friend who told me a lion would totally own a gorilla, but I told him from the sheer power the gorilla has, and his ability to maneuver during the fight better, he would win.

So what do you think? And why?