I think the issue is what is EASIEST, not what is best. An car with an added 200 horsepower isn't going to care how it got that way. Can the lower end of the motor hold up? Can the rest of the parts in the drivetrain handle it? 200 horsepower is 200 horsepower, as far as those parts are concerned, no matter how you got it that way.
But I think of all the power adders I have been trying to understand, nitrous scares me the most. It seems easy to use, and may very well be the best way for some people, but for some reason I never even consider that as an option for me.
Actually all things considered for what I would want out of my car, the twin turbo chargers seen the BEST. Main reason is that it is generally a gentler system on the drivetrain since there is somewhat of a modest spooling up of the power. Superchargers have better low end, but the cost is it can be much harder on everything having that instant on power. I think you would need to be more careful of how you launch yourself to keep from breaking things if your tires get too sticky on you. Street tires will be the circuit breaker to keep you from breaking other things, so once you mount slicks, you need to be careful.
But heck, what do I know? I'm only going by what I have been reading feverishly, so I'm just offering my opinions of what I have gleaned from other people's mistakes. One thing a friend of mine said a while back, after he had sunk MAJOR MONEY into his Porsche, that really stuck in my mind, was "You know, now I really wish I had spent that money on other things.....". :thinkin:
But I know the attraction of HIGH PERFORMANCE and it's siren call....