Personally I use the mig with the gas myself. I think it's a cleaner weld. But the welders I worked with in Kandahar told me they actually prefer to use both at the same time: flux with the inert gas.
One thing to watch out for is the polarity of the gun. If you change to inert gas, or go back to flux wire, you have to reverse the polarity just inside the welder where the cable attaches. Otherwise you will pull your hair out trying to get decent welds. Please don't ask me how I know this but suffice to say it's a lesson I have learned twice.
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