Communism, is a better system on paper. On paper, a chain letter is an ideal business model. So, yes, communism is a better system as long as it is not applied in a real world setting.
All that is accomplished in an economic setting, is governed by market forces. What are market sources? Market forces are multitudes of people all pursuing what they want in terms of self interest. For communism to be effective market forces would have to disappear when a communist system is put in place. Self interest is part of human nature. Self interest never disappears.
Whoever or whatever is in charge of a communist system acts out of self interest. In a free market system, self interest lends toward efficiency. In a communist system, self interest generates inefficiency. It is as simple as that. Thanks for asking.