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.
https://en.m.wikipedia.org/wiki/False_dilemma
“Not capitalist” does not mean “communist”. There are plenty other systems out there. And even for what many folks call communism you’ll find examples of much better efficiency - China for example has been developing at speed never seen in nominally capitalist countries.