I believe compressed air/nitro tanks are high compression tanks, allowing you to have a larger source of propulsion for the paintballs. (ie--3,000-6,000)..................................

One of the main reasons to choose compressed air is that, unlike CO2, it is not a liquid while in your tank. This alleviates the freezing up problem presented when liquid CO2, which is freezing cold, is accidentally siphoned out of the tank and into the internal gadgetry of your gun.
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Another main reason to favor compressed air is that it provides consistent air pressure, especially when the air tank is fitted with a quality regulator valve. Many markers, especially high-end ones, require a constant and uniform amount of air pressure in order to function optimally. This is why many experienced players use only nitro or HPA.

so "better"....yes
"longer"....iono i use co2