I have each of the three at my shop. If you can wire a 220V where you use it , then you definately want a Mig. Make sure get the argon gas with it, FLUX CORE SUCKS. If you only have 110V a mig isn't worth using on any more than more than sheet metal. In that case you want an arc welder, they can do more with less voltage. Takes more skill to get a nice bead, and if you're starting out make sure you get some anti spatter spray, you'll do a lot less cleanup with the grinder. You don't really NEED a Tig unless you're doing stainless or aluminum, the they're invaluable but expensive. As far as brand, I always stick with Miller, hasn't let me down yet. Lincoln is good too. I have a Miller 480v single phase Mig at my shop, a monkey can run a nice bead with that thing.
So, 110v Arc
220v, Mig
That's my $0.02 :nothing: