Biggest difference between the Marlin 39A and a Winchester 9422 is weight and weight distribution. I get to shoot lots of guns as part of my work, and I have seen many Winchesters that shoot great off the bench but you can't shoot well offhand because of the light weight and weight distribution. They both should shoot really well once you find what ammo they prefer, but the heavier, weight-forward Marlin is a lot easier to hold steady than the lighter, weight rearward 9422.
Never try to educate someone who resists knowledge at all costs.
But what do I know?