As Vinny and I have pointed out, the sabot slugs can benefit from stabilizing spin imparted by a rifled barrel or a rifled choke tube. Shotguns thus equipped are pretty much "sabot-slug-only" affairs. They won't pattern shot (bird or buck) well at all. The rifled shotguns are substitute rifles for "slug only" hunting. They have little utility as a defensive shotgun. Clearly, they CAN be pressed into service defending oneself, as can a .22 short ISU target pistol, but they are less than optimal for that use.
The defensive shotgun will be a smoothbore. It will handle buckshot (its primary load) and slugs with aplomb. Its smoothbore barrel may have some degree of choke, to better keep the buckshot together. This will not typically hinder decent slug accuracy.