From my understanding around 20 million Russians died during the war. The highest, most extreme estimates puts that up to 35 million.

Every mainstream estimate I have seen about the deaths caused by stalin are around 30 million, but I've read as high as 40 million.

Also, many russians died during the war because of Stalin's ridiculous purges of the officer corps in the Red Army. Stalin even condoned anti-Jewish pogroms and all this on his own people!.

Both men were absolute monsters, but at least Hitler was fairly decent to most germans.