Dauntless said he had a 110A machine, so a 140 A would probably be a good amount stronger. There is also variation in the welders, if you have a Harbor Freight there are web pages that describe how to beef it up a bit by adding a capacitor that the Lincoln/Millers have that the HF unit does not.
The other thing is that the 110V-120V supply varies from house to house. I think the power going into the welder unit is a lot higher at 120V ( goes by the square of the difference), about %20 more at the arc, so that's a good difference too.
I was lucky and found a "refurb" unit at Home Depot. It was a 180A for half price. Looked pristine except for "refurb" scratched onto the cover somewhere.
It had a tragic flaw though - the spool of wire was badly made, I could barely get it off the machine. Like I considered using a bearing puller was how hard it was to get off the machine. After that it worked perfect!
Spend time going thru the machine looking for gas leaks. I did some practice a couple of weeks ago and forgot to turn it off, but it holds pressure in the line for a day even if I do turn it off, so I was glad for the effort I put into that.
If you go 110V I do think you want the larger ones and having good wiring is a big help.