Without even looking at price, both would exhibit scavenging properties. I woyld lean towards the second design with a true x fashion looking for power. And the wail from the exhaust would undoubtedly be sexy.
Funny this thread comes up. My daughter is having done tomorrow. Along with her Adnoids. She's had ear problems since birth (now 6). It'll be nice not have to yell at her when she's not in trouble.