I would say both guns have their advantages. If you are in the duck slough I would go for the 3 inch model 12 it has the weight to tame heavy loads and will eat shells with mud on them. I have used the mag model 12's for years they swing nice and work. The 37's I would say are more of a upland gun nice and light, 37's can get little mule like when shooting magnum ammo. I shot some of the magnum 1 1/4oz copper plated 4 shot in them and I knew it. They both have adavantages I guess it depends on your type of hunting. Big heavy loads or hot reloads in the duck swamps mod 12 hands down. Target or field loads and lots walking I would choose the 37.
