Go for the big friendly giant (his name is George). All he wants is to be sure that he is the alpha animal in the cage — and he is. He can easily kill you, but gorillas don’t have the habit of killing other animals. Unless you count termites and the like.
And then there is Lenny.
Lenny was cute when he was a baby, but as soon as Lenny got agitated as an adult, he could be a bit aggressive. Mauled a woman once or twice. Ripped off her nose and ears, both hands, and chewed out her eyes. (His real name was Travis.)
(They go for the softer tissue.)
Chimps are not satisfied with the alpha stamp — whatever is out there has to die, and it first has to suffer. Chimp clans are well documented to go after other clans and tear their enemies apart, and eat them as well. They also do so with the leaders of their own clan — if the laws of hierarchy ask for it.
They also kill other mammals — even apes and other primates — on a regular basis without the least amount of pity, and eat those guys as well. And chimps are also known to have killed gorillas.
And there’s so many human victims known in domestic violence related to chimps (sounds good, doesn’t it), with Charla Nash probably being the most famous example, that the silverback gets all the benefit of the doubt.
The simple truth is that George will only go for dominance.
Lenny will go for damage. (And then the kill.)
SOURCES: Google images and the footnoted sites.