MIG welding gas preference

Of those of you who have MIG rigs, what gas mixture do you prefer and why?
I just got my welder converted for gas and have adaptors for both CO2 and
CO2/Argon mix.  I expect to weld mostly spridget sheet metal. Thanks.

Regards,
Glen Byrns
'59 bugeye
'59 Morris Traveller (Winifred)

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