Comparing numbers nominally is a bit unfair, as communism is a much more modern economic philosophy than capitalism, and so operated in a much more populous world, but as to direct violent deaths by capitalism, you can start with many of these here: https://en.wikipedia.org/wiki/Genocide_of_indigenous_peoples

It's true that one could say that that kind of capitalism wasn't really capitalism, or that capitalism has changed since then, but the same could be said for communism.