Pistol grip
Pro:
Shoulder stocks with pistol grips help in control and recoil management.
Con:
Slight addition to weight(which has a positive effect of absorbing recoil)
one extra thing to snag on something
generally cost more
Overall:
the tactical look is just that, a look.. Any birdgun of similar barrel length is just as capable and just as managable. Its just a matter of preferences in eye candy.
If you're a shotgun shooter, the pistol grip wont matter much. Nor will tactical sights when using shells of buckshot or birdshot. Slug accuracy would most likely improve. If you're gonna use buckshot, a bead sight is plenty for aiming and will less likely catch on your wife's knit curtains/table cover as you sneak around the room to get into a better position.
Here is my tactical home defense/anti-dove/rabbit splatterer:
