I have both and I use both. Sheetmetal, particularly floorboards and things that are hard to fit perfectly, I use MIG. Most things that are visible, or I can do on the bench, or aluminum obviously, I use TIG.
MIG is more forgiving, but really good MIG welds require just as much setup as TIG. By setup I mean fitment, cleanliness, and getting the right wirefeed and voltage.
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