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My guess would be style.
If you notice, the Mercedes and Hyudai have their angles completely opposite.
Freebeard - I don't see the serrated edges - at least not small ones.
My understanding of these serrated edges, was that they cause the air to go slightly turbulent as it exits, acting like a vortex generator.
In the engine shroud application they are for, as you know, a reduction in noise.
BTW, I added serrated edges to my boattail at the edge of each segment for a clean attacment at each transition.
A solar race car used this feature for a clean airflow break just behind the driver canopy.
With the designs we see in the images, there aren't any "teeth" and I'm wondering if it would have the same effect that you get with several serrations.
BTW, my neighbor has that Hyundai.
It has vortex generators molded into the body just above the tail lights.
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