At the risk of coming off as an "internet expert" IMO at 8 PSI boost both systems should produce about the same HP. I think there would some variance in tuning, environmental conditions, and most importantly, Dynamometer used.
8 PSI over ambient is 8 PSI no matter how it is developed.
I would agree there are certain advantages to HP's shorter exhaust and intake lengths in throttle response but Wil's kit has advantages in heat soak limitations by his turbo placement.
Both systems (as well as Love-Fabs etc) have their pros and cons which is why there is no definitive "best" system. Especially when cost, support, availability, etc, etc, is factored in. It turns into which system is best for you.
But once again IMO, in a perfect world and for the NSX, turbo is the way to go.
This from someone who just bought a Basch system.