Turbo kits are generally more expensive and harder to tune, have less low-end torque with a little turbo lag, but offer a ton of top end horsepower.
As for blowers, they are generally cheaper and simpler. Root style blowers offer a very flat torque curve - they will give a lot of low end torque, but not as much top end horsepower. Centrifugal blowers give you more top end than roots style, but have less low end power.
For a street car I would probably stick with a blower instead of turbo unless you have a lot of time and money.
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