Think of the Miller as a bit more of a Cadillac,,, with this auto set a 6 speed automatic transmission vs a 5 speed manual in the Hobart. They put a few more premium features on the Millers, in truth, in this small class of machine I actually like the manual most of the time. I like the taps over the variable voltage on some units even, so easy to repeat, use the same settings vs trying to fiddle with the V knob to get it back.
My little red one has a 5 speed, use 3 settings, thin, medium and thick, don't have to test it every time I make a change, just pick and play.