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Much better efficiency - sure, if you don't believe in ghost cities and ignore the real estate hyper-bubble (which is certain to come crashing down).

So objective, easily verifiable gains - like the life expectancy, which is now longer than in USA - don't matter because of ghost towns? :-D

What are the other systems that are actually being used?

barter at the very small scale

some top down goes on it troubled countries

but by far and away the advantages of capitalism are more than its deficits

it responds to and is driven by human natures, not the other way around

China is in fact a capitalist country, despite the "Communist" in it's party's name.

Partly. Most of the Chinese people have no private property rights.