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I agree with Bob on all counts.
Fact is, if you're going over 10 mph, the fan basically does nothing but add drag and make noise. A flex fan, with it's coarse pitch at low rpm, can help keep things cooler at idle when stuck in traffic, but that's about the only benefit.
Condition of the radiator and rest of the cooling system is a lot more important than the fan, and tuning has a real impact as well. I don't even have a fan at all on my hot-rod B20 (except for an electric one that never comes on if the car ismoving at all, even on the hottest days), and it never gets overheated at all.
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