Neither has real socialism since there's always some kind of market forces.

That said, we don't need pure market economies or pure command economies to draw conclusions about which is better. Highly market economies and highly command economies exist, and when we compare like with like, the market economies produce more wealth and generally allow people to live more fulfilling lives.

This is not to say that markets solve every problem or command economics are the source of every evil, but markets are still a dominat strategy.