Nitrous is better because there is no room in my car for a blower belt, and the steering shaft prevents a turbo manifold as well.
Seriously though, I like turbos, but the idea that nitrous cost more is ridiculous. Finchstang's car was just as fast on bottle. Sure now no expense for filling bottles, however, how many times can you fill a bottle for the expense of a $5000 turbo kit? Take a car like mine or some other unusual application and now you have to double that price for the turbo kit (not commercially available - all custom). Also if you have a carb rather than fuel injection, you have to get that ironed out as well. If you already have fuel injection, then that makes it easier. In my case I would have to figure out a manifold, then a blow through combo or fuel injection.
How many times could I fill a bottle after buying a $500 kit that makes 250 HP? Its a no-brainer for me.