IMHO on the thicker "softer" metal used back then, OXY is a great way to work..... and is usefull for heating cutting and doing other butchery
But the downside the oxy can work out more expensive to setup and maintain.....
Migs are good - if you are shopping for one I'd say go at least 195amp.
Arc will be next to useless. & TIG plain overkill.
Oh yeah get NOTHING that says "SIP" on the side as it's italian for "Shyte".
Then practice practice practice.....
Oh yeah I'm not taught, I just started making my birdpoop sculptures in the shed....Although I still plan to get a proper edumacation one day.