Racers often choose a turbo for this reason, because unlike a blower, a turbo can be controlled with any number of devices, from a simple mechanical dial to increase or decrease the max boost pressure, to a sophisticated electronic boost controller that can be programmed to ramp up boost. Moreover, the new crop of electronic boost controllers are not only very sophisticated—allowing you to set max boost, boost per gear, and time on boost—but are often integrated into many EFI controllers, bringing the total cost down. Choosing to go with a turbo can be a wise choice when building a drag or grudge-race car because you can literally tune the boost curve to stay just barely on the edge of traction for the entire run down the track. If this sounds like it's very similar to how nitrous racers use a nitrous controller, you're correct.
