In terms of being a functional system which allows for political dissent, unlike the Soviet Union and every other communist country
The difference between capitalism and communism is that communism requires everyone to believe in it and participate in it or corruption takes over, but capitalism works whether you believe in it or not.
There's still corruption in capitalist societies, but sometimes the ability to have political dissent keeps the corruption from completely destroying the system. In communist countries the control of the Party is more like a feature than a bug..