Unfortunately not. If socialism was superior I would think more countries would use it than currently do, since there are only a handful. Some countries like the USSR have had noted failures with socialism. However, I don't think capitalism is superior either. Maybe we just haven't had enough history yet to really decide either way.
No, history has not shown socialism's superiority, because socialism has failed every time it has been tried. Europe is socialist, and is currently in financial crisis. China is socialist, and it is very poor. Russia has many socialist qualities, and it is also poor. It is easy to give away another person's work or money, but that creates no incentive for work. The richest countries are capitalist.