I spent quite a bit of time researching this as I plan to build a shop and fabbing my own armor and bumpers. Although I have reserved buying one until after I move to PA, everything I have read points me to getting a 220v unit, be it mig or stick.
The difference in price to step up to a 220V mig isn't that much, yet it gives you many more uses.
No matter what you decide to go with, look at the duty cycle when buying one. A cheap one with a poor duty cycle could be quite frustrating if you plan to use it for 1/4" steel (if it even properly welds it at all).
Admittedly I have never even welded, but the advice I am offering is what some very experienced welders have told me.