Communism without Stalin

Seeing how Stalin seems to have become the face of communism amongst average Americans, my question is what direction would Communism go down if Stalin never came to power? This isn't just referring to the USSR, but Communist movements across the world. How would, say, Chinese Communism be impacted? How would the western view of Communism be impacted? And so on.
 
It highly depends about POD and what happens to Stalin. Would USSR still be exist? If not would there be another first communist state? If USSR is still exist, who then succeeds Lenin instead Stalin?

Things might go many way.
 
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