ISEKI TA 247. Stihl Saws Gravely Zt's Polaris ATV's State Of The Art Welding Equipment
Not everyone needs Tig. I seldom use the 5 tig welders I have. ( 2=AC/DC ) But it's nice to have one for critical welds that you don't want blobbed up with wire. I mig most of the time and only have 3 of those. It just happens that way over time. Any welder (s) you can get are good but the old saying goes, He who dies with the most welders, Loses. You could have used the capital on your 4th or 5th tractor.
Don't use the tig much, but for aluminum it's basically the only option. Did tig my shooting rest for the control available. One guy at the range looked and noticed, said "you got a tig, eh?" Gave me that warm fuzzy feeling. It's about the control.
I suspect that I wouldn't change wire size very often. Unlikely to weld much on sheet metal or thinner gauges. Both of the originally mentioned welders seem to do .024, .030 and .035 without any more than the feed wheel adjustment.
TIG is probably quite unlikely for me. But who knows once I get better at welding with a MIG. There's a ton of stuff I never consider doing with my stick welder because it is just too 'coarse' for smaller parts and thinner material. That and my problems striking an arc reliably with it.
I would go with the Hobart. It will do just fine for your needs for many years to come. If a multi process is in the cards and you aren’t brand loyal the Lincoln 210 MP has been around for several years and has a good reputation. You might even find a used one kicking around.
More than 40 over the years. Ten at any one time. Mostly Ford and New Holland
If money is tight I would take the Hobart.
The Miller would have QUICKER resale attributes but you would recoup a better financial percentage with the $500 cheaper Hobart if and when the time comes to upgrade or liquidate.
Of course ideally you could test drive both under similar conditions to help you decide.