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I've used pretty much all the brands domestically available and I haven't noticed much difference between them. They all seem to give about the same number of shots at about the same power level.
My experience mirrors Treefrog's. The only thing I would add would be to stick with the brand you are using in a particular gun. The shape of some of the heads of different brand CO2 cartridges are different. My theory is the seal of the gun conforms to the shape of the head. Switching to a different CO2 cartridge with a different shaped head might eventually cause a leak.