Historically, saying that capitalism is better than socialism is so obvious that it’s the equivalent of saying that Ibuprofen is better at curing headaches than smashing yourself in the forehead with a hammer. However, because all modern economies today tend to be a blend of capitalistic and socialistic policies, this has allowed advocates of socialism to use rhetorical tricks to hide the obvious inferiority of their favored economic system. They pick out the parts of socialist nations they like, ignore the parts they don’t, deny that every socialist nation that implodes is really socialist, and try to claim that mostly capitalist nations are really socialist.
People who choose socialism (leftism, progressivism) cannot or do not want to compete. They want to be taken care of or they want to control. People who choose capitalism have confidence in themselves to meet their own needs, and want to be left alone to do so. I am in the latter group, and I wish the former group didn't exist.