I have owned both, and use them a lot! The Hobart will eventually fry circuit board. I have had mine fixed twice. It is a good unit..but HAVE to stay under duty cycle. The Lincoln SP is a heavier duty welder..longer duty cycle and better quality.
Now I use the new Millers..best 110 welder available. You will get more hours of use and it's more user friendly. All 3 are good machines, but the Miller is the best.