Capitalism is still a form of slavery were the capitalists benefit from the workforce disproportionally with regard to their investment. And what lifts people out of poverty is work, not an economic system. Capitalism is of course very effective at organizing the environment in a way to enable highly productive work but suggesting that this is a unique feature of capitalism seems hardly justified, we just didn't explore many alternatives. Finally judging capitalism by the number of people it lifted out of poverty seems also misguided to me, there are a lot of people that were negatively affected by capitalism. And a fair comparison should of course not compare the result achieved by capitalism with the situation before capitalism but with the - unfortunately mostly counterfactual - result achieved by an alternative system that started from the same initial conditions.

Fun fact: I always get my share of down votes for being critical of capitalism but no one attacks my position in a response. Do you have no arguments? (provocative face)