In the end it is all be about the people, the individuals of society. They just act in a given system. So you cannot judge about capitalism, socialism as fair/unfair systems. They just build the framework for human interaction.

So assuming that people generally are good, anarchism would be the best system, as the people would freely strive for maximal wealth of everyone without restrictions.

If you assume, that people tend to be bad, systems with more control, like democracy, communism would be your favor.