You can define the handling characteristics of any gun by its weight, balance point (most conveniently related to the trigger), the unmounted swing effort (moment of inertia at the balance point), and the mounted swing effort (MOI at the butt). Longer barrels, all else held equal (for example, a two barrel set where the longer barrels have a barrel wall profile identical to the shorter), will increase gun weight, move balance forward, and increase both swing efforts. There are no good or bad handling characteristices. Like stock dimensions, you want handling characteristics that you shoot well or that please you.
