This concurs with what I've been told.
Hobart is not part of Miller and has been for a while now. It's their value-line. IIRC, the differences come down to some little things like metal gears, and it has more adjustments.
Stick/Arc welder would also be a good choice as well. Although, the welds aren't as nice but they are as strong.
Actually both Miller Electric and Hobart Brothers are subsidiaries of the Illinois Tool Co.
As far as stick/arc the welds can be just as nice it depends on the user and electrodes used and Stick,Mig,Tig are all arc welding processes. Stick is a lot harder to master than Mig for most people, but is the best way to learn welding properly. Like I said before if you plan to weld on your vehicle, take a good welding course to learn how to weld properly in all positions -horizontal, vertical, overhead, with whatever process you plan to use.
I am a certified welder and I'm just trying to point you in the right direction, if you would like to see some of the things I've built go here
http://www.peerless.ca/products/multiaxle/index.php