Presumably the Soviets would prefer it shut, as their Navy would have limited capability to access it anyway and it's of far more utility in supporting the west.
Of course that assumes a lot about the political picture. Are Egypt and other ME nations very Soviet-friendly at the time, or have they turned their eyes West? How are they going to feel about its destruction?
Regardless, having now seen how long a simple mistake can close it for, I think it's safe to assume that in a global war the continued survival of the Suez could be measured in days at most, and it doesn't take a nuke. Eventually it won't even be remotely feasible to reopen it at all.
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