If you exceed ~75 shot of NITROUS OXIDE on a stock motor, not 'naaaws!', you will most assuredly promote rapid disassembly of your engine, as did many a Tiburon driver back in the day with their aluminum V6s.
The reason is because the turbo motor offers lighter weight with greater and more affordable scalability. For example, with just some software tweaking, the Theta II car is all but caught up to the Lambda car in terms of acceleration and top speed.
From there, the Theta II offers a very easily tweakable machine which you can take anywhere you want, quickly and easily. Ergo, you don't have to deal with two separate valvetrain sets, two sets of headers, four cams, etc so on and so forth.
The morale of the story is that if you want a relatively high HP car out of the box and you have no intention (or wherewithall) to modify it, buy the Lambda car.
If you are a crack addict like me and cannot keep yourself away from the engine bay and under the car, you need to buy the turbo.
The Theta II car offers a superior power to weight ratio the moment you begin tweaking the software. This is by far not the first car to see this sort of aftermarket treatment or even race track treatment.
Take for instance Castrol Tom's Mark IV Supra. Amazingly enough, this car pulled the legendary and much-mythologized 2JZ80A motor and replaced it with the MA70's four cylinder turbo motor.
The rationale? Lighter weight, same/roughly same power, better balance, everyone is happy.
If you are into the primal hobby of American Drag Racing however, there is no replacement for displacement, and you are best off buying the Lambda car.