IMO, I think (JDM) Kouki flows just as well as Zenkis. I don't think either looks better than the other, but Kouki is closer to today's styles. This thread just proves one thing: people grow to love their cars, and people just have unique tastes, so you can't call one any better than the other.
In the pic below, I believe jdm kouki flows nicely. And like others, the USDM front bumper is okay, but looks a bit too messy for the overall clean style of the car.