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Whether they're just as good or not would depend on how you want the car tuned. For any way that an engine can be tuned with SOHC, it can be done with DOHC as well, thus making them equal in those situations. As has been explained, though, DOHC gives much more flexibility in tuning and a car can be tuned in ways with DOHC that it cannot with SOHC.
Or at least that's how I see it, correct me if I'm wrong.
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