Sort:  

I think this is a false dicotomy. It's not command economy vs capitalist economy. It's socialist vs capitalist.

We are not that far off from a society where a few large super-monopolies control the world economy for the benefit of a minority. It can be argued that such a situation is a "command economy". That scenario is far from a true socialist economy.

the most common form of socialism is a command economy

also that would still be more efficient than a market in many ways.