Once you reach a certain level, whatever that might be.... quantitive, methodology, inhumanity..... differences become moot. I’d score them both as a reasonable definition of ‘evil’.
Germany had the largest Communist Party outside of the Soviet Union in the early 1930s. Had Germans chosen Communism rather than Nazism the world would be entirely different today. Germans had to choose one or the other. There was no third alternative. By 1930 the Soviets had already killed millions. Nazi crimes were in the future. For many Nazism was a reaction to Communism. The anti-Semetic component of National Socialism can be explained by the large Jewish contribution to the Soviet cause. Compare the number of films dealing with Nazi crimes with the films produced about Communist crimes. Every major western city has a Holocaust museum. Where are the museums devoted to the Holodomor? “We must never forget.” But what if we don’t know what happened? How can we forget it? Who cares about the tens of millions of Chinese casualties of “Hope and Change”?