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There is no one "ideal". If there were, it would be universally used by now.
There are a ton of different constraints that an automotive shape has to satisfy. And each choice made in one affects the possibilities for other choices. As was mentioned, the air curtain thing is pretty meaningless if you have covered or spatted wheels. And if you want more air going under the car, the nose shape will be different than if you want less going under the car. And don't forget cooling ducts and exhausts.
It gets complicated in a huge tearing hurry, and it depends rather a lot on just about every factor going into the car's design.
We have seen "good" noses, more than likely "good enough" ones, such as the well-known Template. But there isn't really any "best" one, IMHO.
-soD
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