Pointless debate.
No one can agree on what the capitalist nations are, do they include Nazi Germany, the colonial Spanish empire, and Latin American dictatorships?
No one can agree on how many people were killed by Stalin. The 20 million Soviet citizens who were killed by Nazi Germany tend to get lumped in with Stalin because it happened on his watch. Stalin's great terror resulted in the deaths of hundreds of thousands of perceived political opponents. Rightwing American media personalities have the impression the gulag was a system of mass genocide, when it was actually a system of forced labor. Stalin wanted slave labor, and mass genocide would not have served that purpose.