I started out with a bead on my 870 26" barrel. I went to a 20" cantilever barrel with a dot scope. Now I have an Encore 20 ga with a 20" barrel with Tru-Glo sights.
Pros and cons
I hunt in Michigan woods and swamp edges so the bead works for those ranges 15-30 yds. No batteries
The dot scope was good a little more precise but at those ranges I really do not need it. It uses batteries.
The Tru-Glo sights work excellent. You can see them in low light even if it is not enough to make them glow, under the canopy. No batteries.
I would guess as I age and may try to stretch out the ranges sitting in a blind looking out into the open fields a magnified crosshair might be nice.