Hi
I prefer the MIG welders. I have a small 120V Mig w/gas unit for sheet metal, and I upgraded to a larger 250A model for larger material as I progressed in welding.
I think one of the 175A / 220V is a great compromise in dollars and size. The 220v units have much more flexibility due to the power increase.
No matter what you choose, I would recommend that you invest in an automatic helmet. I resisted this for several years as an unnecessary expense. I was quite wrong !! The ability to see exactly what is happening is crucial. I used to get setup, flip my helmet, and pull the trigger. I usually takes a moment to get oriented and start welding. Sometimes quite a bit of wire can feed during this initial moment !!
The auto helmet will greatly increase your learning curve with any type of welding. Have you ever tied your shoelaces with your eyes closed ?? You can do it, but it takes a little extra time.
One extra comment. An inexpensive solution is one of the Lincoln AC/DC stick welders. The DC version sells at Home Depot for around $299 or $399. They penetrate well and with some practice you can make a decent weld. You have to chip slag and they make gads of smoke, but they are simple, bulletproof, and inexpensive. No sheet metal work though !
John