OK I'll play
nitrous
Pros- Low buy in cost, lots of power when you want it, Stock power when you want that, Day to Day driving is a normal car, Don't have to worry if you let someone else drive it (take the bottle out), can run regular gas when not spraying.
Cons - Refilling bottle sucks, Don't have the power there ALL the time, Others look down on you for nitrous (never have gotten this one), people use as excuse as to why they lost, can be hard to tune, can have backfires ( have only seen happen or heard of with more than a 100 shot) , did I forget empty bottles suck, may or may not be legal in your area.
Supercharger
Pros- power all the time, sounds cool, looks cool, never empty
Cons - power all the time (think about bad weather and another 100+hp), may have to change other parts, may not be able to drive in winter ( some your not suppose to operate below 30 deg F), High buy in cost, need premium fuel all the time, if not properly tuned BAD things happen quickly. letting someone else drive it.
Ok that's what I think. Now what I'd like is a nice KB with a lil shot to back it up but that's me.