The other difference is that in capitalistic societies people can criticise the ruling ideology openly on public forums like HN and not be murdered for it.
Isn't that something that is rather supposed to be granted by democracy and republic? Sure such a regime can enact capitalist policies, but that is never mandatory nor exclusive: capitalism is also implementable in oligarchic plutocraty.
To be clear, I didn't mean that capitalism or communism is worst or even equivalent on all matters.
I'm unsure of what you mean with body count here, and have no clue of what metrics and quantifications it is supposed to show meaningful important differences.