I'm not sure what the difference between Argon/CO2 and pure Argon is. However I do know that CO2 produces a hotter weld and more splatter. It all depends what you have been taught how to use and how easy it is for you to get a hold of.
I do know however that Argon/CO2 is the preferred mix, however it does cost a lot more than CO2, especially if you can't find a rent free supplier.
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