Ive played with the full range of stuff over the years.
First MIG I bought to play with myself was a cheap gas/gasless unit.
Tried it gasless, but it needed to be fairly thick steel to get a good weld.
Went and bought gas cans from the welding shop and the weld quality improved greatly.
But there was only around a minute or so of gas in the cans.
Bloody expensive exercise.
I now have the MIG setup on Bunnings Gas.
Have just bought an AC/DC Tig to play with but havent got around to that yet.
The idea is to tack things in place with the MIG then finish off with the TIG.
TIG welds arent as hard as MIG welds so are easier to grind and hammer if needed.