I disagree with your premise about a positive light (source?)

As between the two, Hitler was openly practicing genocide. Stalin was the primary cause of the famine of 32-33 and the Great Purge.

Under the Five-Year Plan system, the country underwent collectivisation and rapid industrialization but also experienced significant disruptions in food production that contributed to the famine of 1932–33. To eradicate those regarded as "enemies of the working class", Stalin instituted the "Great Purge" in which over a million were imprisoned and at least 700,000 were executed from 1934 to 1939.

In essence, Stalin killed, deliberately or unintentionally, his own people.

Hitler sought to commit Genocide not just in Germany but across the world.