I chose, and always will choose cooperation over competition.
I'm against competition on a philosophical level. Human to human competition, in any shape or form, is an abomination of actual competition for survival. We implement rules and boundaries to what is ethical, what is humanitarian etc. Even in games, we strive for equality and balance, where none of it has any place in nature. In nature, balance emerges because physics. It balances out because the capable survive and the incapable die. Since we are so far above any natural competition in real life, as long as we cooperate and live in stable societies, all the competition we invent for fun is nothing more than a weak nod to our ancient nature of cold blooded survivors.
Cooperation is our natural state in real life, after millennia of evolution, even if some of us are not aware of it. That's why we apply for jobs or try to create our own and have other people work with us in cooperation instead of trying to bash each other's face in for a fruit tree on a hill.