I'm probably a little biased here but there's not one answer. N/A may be the purist way to make the power but is pretty straight forward regards installation etc. Power delivery is also not nearly as smooth with an N/A engine as it is with a supercharged engine.
Chassis strength and drive line components will require work which ever way you go.
For me it was just doing something different, packaging everything inside a Seven is quite a challenge, the result is very enjoyable.