Also to my last post, before someone replies something. This is my opinion. If you go to any formal school they will teach STICK first and I can understand why. A monkey can run a MIG, It is the easiest form of welding available to the masses.
However If we can be hypothetical if you take two people, One who has only ran MIG (GMAW) and one who has ran STICK (SMAW) for years. Now take those two people and give them a basic lesson in TIG (GTAW). The one who learned STICK will have the advantage since STICK is much more sensitive to user error watching ARC height and maintaining it mainly.
Now this doesn't mean this person who learned STICK will pick up TIG will be able to run it right off the bat. It's just less cumbersome, the best way I can describe learning TIG is like riding a bicycle expect The bikes on fire, the road is on fire and you have to figure out how to ride it without burning cause Satan is behind you. You will eat though electrodes, have misshapen puddles, bad penetration, and ETC. TIG is also a process you have to have lowish air movement as in a shop/garage or a portable tent in order for good gas coverage. (Same goes for MIG just slightly less headache)
At this point you might be asking why the hell anyone would ever run a TIG. There are upsides, when running right you will have amazing penetration for the heat distributed. Speaking of heat there's less of it put though the work piece (*Arguable*). You will be able to work with stupid thin metals compared to MIG/STICK (With a good machine). You will have ZERO I mean ZERO splatter with TIG. ( When both you and Machine are running right) Also if it's metal it's probably weld able with TIG. Those are just some of the benefits to running TIG off the top of my head.
Now something that MIG does great. PRODUCTION!
With MIG you can literally run forever (joking) because you can keep a continuous weld going where both STICK and TIG can't. The least amount of splatter I've seen has been running STARGAS where commonly it's 25% Co2 and 75 Argon OR 100% Co2 depending on wire that is.
Now there is Shielded MIG wire which is gas-less. But you are talking splatter city. It can also lead to porosity if it is damp. Some say it would be awesome for pipeline welders However I can see a partial argument against it. Once it gets damp it's done. I can't bake it in a metal oven like a STICK and dry it out. Since it's on a plastic roll. Once it's damp it's going to splatter even worse and have a higher chance of porosity.
If you have questions message me.
I would not consider myself the greatest of all time but I can attempt to answer questions if you have them and if I can't answer them I can get them from people I would consider the greatest of all time. This goes for anyone on this site.
Attached are some sexy TIG welds. (Just from a quick search)