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It depends.
What are you doing with the car?
If you are doing mainly track days, lots of 100+ to 40 mph braking with short straights, bigger is better.
If you are doing mainly street, going smaller (or none) may be better.
Again depending on what you are doing with the car, and the relative temperature you are doing at, and is it raining, and, and, and
You may not even want to cool the brake calipers.
You may want to cool the wheel, which helps cools the tire, which helps keep the rubber in their optimal temp range.
Everything has an "optimal temperature rage", and you want to optimize to target that temp range.
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