This thread is hurting my melon..
If in eastern MA or RI, the relative hilly terrain means that
at most the farthest shot you might get is something like 20 - 50 yds. I would use the smooth bore barrel, load a regular slug first, and then some buckshot for the second shot. The third shot is meaningless, as the creature is long gone by then, and the best that you can hope for is "spray and pray".
Don't use a scope if only shooting at these distances, as the target may be moving too fast to get a proper ...ahhh bead on it.
Based on that, a smooth bore barrel, no scope, and a regular slug is preferred.
If you are hunting where longer distances might be involved (beyond 50 yds or so, or in Montana) go with the rifled barrel, Sabots, and the scope.
This is not an exact science, as the prey tends to move about unpredictably.
Where will you be hunting?