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@TheBrick(Tommy)
A well set up mig for the right job will produce good welds once set up for that combination of tubes. Most mig welders you see though are geared to wards car work hence why people don't think of them for bikes. Mig welding is the standard for most manufacturing set ups due to it's cheap set up cost, fast production and lower skill level need to produce a weld and ease of automation. once setup mig welding can be very consistent which can be useful for a large scale manufacturing process.
Tig welds tend to look better and are smaller.
I would take the guess that a Fuji track would be mig welded for ease of production. From memory the welds did not look super tidy like a good tig weld.
This is all guess work and personal opinion on my part though and does not come from specific bike building knowledge more from general knowledge.
So to summaries my waffling I guess mig due to the mass produced nature.
Advantages of tig would be the pretty weld.