I voted for spray because the "up-front" costs are more in line with the budget build I am doing. Would I rather have a turbo? Hell yes. Can I afford one? No.
Also, a full bottle lasts one minute so, if you do the math, a full bottle does not last very long at all. It is a royal pain in the ass to constantly be filling bottles. The good news is when the bottle is empty your car is not being put under extra stress. The bad part is the $35 bottle refills and the fact that you have a slower car if the bottle is empty.