Well, the Germans were fighting on multiple fronts (Whereas the Allies would be attacking from multiple fronts), and let's not forget how crucial US supply was to the Soviets. Yes, they manufactured a huge number of tanks from their Siberian factories, but their doctrines of the time called heavily for the use of lots and lots of trucks to move infantry in to exploit the breakthrough made by tanks, and Soviet industry could only build either a huge number of tanks or trucks. During the war with Germany the Soviet Army rode forward on Dodge trucks (US supplied trucks), if they went to war with the West, the supply would have obviously stopped, and once they started losing their trucks in great numbers, they lose a LOT of their efficiency, it's not exactly the same as the war with Germany, it's the Soviets alone without Western help.... against the West. I would most definetely put my money on the West, massive Air Superiority, and Naval Dominance, plus manufacturing abilities puts them way ahead of the Soviet numbers.

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- Your freindly neighborhood cynic