I am not sure on the models you are speaking of, but on various welders I have used, I have found the bigger welders smoother to weld with
It may be different on the model you are talking about, but it does seem the bigger welders make a nicer job on smaller welds
Years ago I had a 225 Lincoln stick welder, then bought a large 250 amp Miller. Laugh if you like, but it welded thin materials quite well. I have a scratch start TIG for it which is nice, but not as nice as the TIG we have at work(foot pedal)
I have a 220 V MIG as well. Bigger MIG s are easier to use than it
For me bigger welders seem to be easier to work with, so I would buy as big a unit as I can afford(as $$ as I could afford)
I will be buying a foot pedal TIG in the near future