apples and oranges
Its an apples and oranges comparison.
If your spraying them on the outside of the intercooler, the N20 is "capable" of cooling more, but the economics are out of the ball park unless your just using it for a single drag race pass. I think guys have used up an entire bottle of N20 in a 2 - 3 1/4 mile passes.
If your using it as an internal coolant, spraying into the intake tract you also have to muck around with the fuel to keep from going lean with the N20 due to its oxygen content. With the WI you can simply up the injection rate without needing to worry about melting a piston.
Larry
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