ahh yes, my father has a CIG Comet 3.
Which is an Oxy Act. Set (Gas),
I think it is horses for courses,all the different types are best at some things and hopeless at others, an oxy set can weld brase and cut if you know what you are doing, stick welder is good for heavier welding, a mig can do both car bodies and the heavier stuff (depending on model bought) and a TIG is good for the stranger metals (Stainless etc.) as well as normal welding.
But you have to know how to drive this gear, suggest doing welding course at tech, there you get to try the lot without first buying, or visit GIG depot and talk to the sales rep. don't have to buy but they should point you in the direction of the best unit to buy to suit what you want to do (be honest with what you actually want to do)
Good Luck
John M