Money would be my choice. The reason its my choice is based on the fact that when you have money you have power, you have authority (or the potential for it), and you can manipulate the numbers. Let us look at america for example. Do the people have any authority? No not really, yet the people who are middle to lower class comprise the majority of the population. Do the rich people have the numbers to combat the majority? No, but the rich people have enough money to influence the majority and bring about whatever change they need to in order to achieve the desired agenda.
What would benefit society or an individual? Knowledge.