MIG vs TIG

I like the flexibility of TIG, I can easily switch between mild steel and stainless, different thickesses, etc.

TIG is a challenge when it's difficult to get the electrode and rod where you need it (e.g. the inside corner where two pieces of angle iron meet to form a right-angle corner). And the footpedal is a pain unless you are sitting down. A hand control is easier if you are moving around or standing up.

If the goal is to quickly and easily put things together, MIG is better suited.

Best of luck.