Socialism has failed 100% of the time. You can't get worse than that. Even if capitalist systems failed to improve the lives of the poor 95% of the time, it would still have a better track record. In reality, the most successful countries are all capitalist and free markets have lifted more people out of poverty than anything else.
The fact that some autocratic countries also employ capitalism doesn't change that. Capitalism doesn't magically cure corruption, it's merely a superior economic system. Poverty isn't a function of wealth inequality, it's function of economic development. In a socialist system, the poor may be less poor in relative terms, but they're more poor in absolute terms, because socialist economics eventually fail.
The fact that some autocratic countries also employ capitalism doesn't change that. Capitalism doesn't magically cure corruption, it's merely a superior economic system. Poverty isn't a function of wealth inequality, it's function of economic development. In a socialist system, the poor may be less poor in relative terms, but they're more poor in absolute terms, because socialist economics eventually fail.