Timing is the most important factor. Had Hitler not needed to be concerned about the West, he would have finished off the Russians, but not in '39.
I still see Hitler's big strategic mistake as in not finishing off Britain first. Had he done so he would have eliminated the Western threats for the time being. Being able to shift more resources East, and perhaps not needing to worry about lend-lease, he would have overrun the entire Eastern half of Russia. He would have added a substantial part of the industrial output of at least two large nations to his efforts against the Russians.
Wouldn't want either of them to win. They were both monsters and both of their systems were a setback to the modern world. Fortunately, they went to war with one another.
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