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TIG is not a great choice...
WAAAYYY more difficult to do...
Metal needs to be spotless. Hard to do with any gaps. Hard to do if upside down. That being said, its a much prettier weld, and much stronger (usually).
Wit MIG, you can do somewhat rusty metal or metal that's not perfectly clean. The grinder is your friend.
I have both, and grab the MIG 90% of the time... I use the TIG mostly for structural joints where I want great penetration... or on aluminum...
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