I grew up under communism. I don't like or don't care for communism, but I can't dispute that China lifted a huge number of people out of a warlord torn mess and misery. To some extent, Soviets did the same to Russian peasants, but of course, it got perverted along the way. But all things considered, I would take communism under soviets to being a serf under the Tsar.
China starved tens of millions of people for two decades, it was only after they started opening up the economy in the 70s and allowed people to own farms/shops that living standards started increasing.
This is just one instance: a hepatitis drug named Solvaldi. Costs $1000 a pill, need 84 pills for full course. How much does the drug actually cost? $300 and you can make it with the Four Thieves Vinegar Collective's chemistry reactor.
But why is this capitalist deaths? Cause 5 million people per year die from Hepatitis. And this drug is a *cure*. But insurance wont pay the $84000 needed for the cure. So they get maintenance drugs that dont cure, and those people die from it needlessly.
And the numbers are going up to 6 million a year of needless capitalist deaths, from a single drug.
We can easily look at corporate death panels, err, I mean medical insurance. Its insurance fraud if we lie, but to them, they can just deny treatment and wait out the death clock.
Capitalism is even more extractive and devastating on the populace. And instead of "capitalism causes X million deaths a year", nope, its a individual's fault. Its always the individuals fault, no matter how systemic the problem is.
Of course, it's probably not really possible to do such a comparison, because there are so many other factors, and state intervention is everywhere even in capitalist countries, via publicly funded research.
I think the only really fair way to compare which system causes more deaths than the other is to look at overall health outcomes and lifespans.