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This is a very interesting question.
You see World War II involved \(all\) the major powers. After World War II ended people looked at the ending of it as a 'new era'. Since World War II ended on a bad not there was a mutual distrust between the western and the eastern bloc. Because of this distrust there became something called a 'nuclear arms race'.
About Stalin and Hitler's plan for Poland, I believe Hitler was possible the more worse one.
Because some good things did developed under Stalin, like as in a decent educational system. And Hitlers plan for Poland is of the crudest sort. Hitler was to deported the people to become slaves.
Honestly I don't think I gave a good enough of an answer, but it's a bit late. I'll try to add more later. :-).
I forgot to add that I meant the early years of WW2. Thanks though.