How many people died in the Great Depression?
I do think it is sterile to compare ideologies by their death tolls. The inefficiency of ideologies cannot be induced necessarily (as in "not contigent") from its effects, as the application of an ideology is contigent on its context: it’s not as if you could isolate "capitalism" from "the 1930’s". Regardless of its context however, capitalism has intrinsic contradictions, ownership over the means of production is in-itself contrary to elementary ethics, and this is both necessary and sufficient to condemn capitalism.
Death tolls are good for populist propaganda (as in "communism has killed 100 million people, therefore it wrong"), but not for serious analysis.
There is one guy from Russia who asserts that at least 7 million died in the Great Depression. He allegedly came up with those numbers by taking a look at the population before and after the depression and even used a 3.5 million deviation for migration and says that there is at least 7 million people unaccounted for. Now obviously many can dismiss this as Communist propaganda, but one has to think about this. Without question there had to be starvation during that time but it’s really not a key talking point by our history books. One has to wonder.