If we're talking what Communism is SUPPOSED to be, then Communism all the way. However, if we're talking about what these two systems turn into in practical application, then Capitalism is better. This poll is a hypothetical, though, so I think that I'm free to choose the hypothetical Communist ideal.
The one that actually works of course. It also happens to be the one that best represents the way humans are and natural law. Its also the least complex of the two, the most efficient of the two, and can even incorporate into mixed governments/social systems the easiest in varying levels without demanding that all other aspects of said social system convert to capitalism for it to still work effectively.
Communism sounds great on paper, but it's too idealistic and not realistic. Eventually, it fails and usually results in a very totalitarian government.
Currently capitalist policies are better suited to our world.
Freedom trumps every time.
Well considering the fact that communism doesn't work........ Neither really is good. However, Capitalism makes us money... so eh.