XOoAPEoOX

You enter an empty room, there are two primates on the floor. One is a small spider monkey, He comes you to you immediately and gives you a hug as you get down to his level, and acts friendly (as most monkeys by nature will), then you walk to the other primate, a chimpanzee, he acts nice at first, but then attacks, it jumps on you, screeching loudly, and bites off your ear while hitting your head with its palms, and acting violent and aggressive (as most chimpanzees by nature will). Now... which of these two primates are humans closer related to...?