Every shotgun has it strengths and weaknesses.
The peacekeeper is very strong and has a high burst potential but is less forgiving when missing as shot.
You really have to trust your aim to get on top in brawl fights.
The EVA-8 has a higher rate of fire / DPS then the peacekeeper but doesn't have a Hop-Up slot.
This will make it less effective on mid range brawls but shines in close combat fights.
The EVA-8 is also more forgiving and is strong in early game brawls.
The Mozambique is a special one, it got recently buffed and is still finding its place.
It has a moderate rate of fire but fires in 3 shots.
It's way less forgiving but with the new Hop-Up it's really strong when opponents don't have shields.
Every shotgun benefits a play style and scenario you could land in.
The Peacekeeper is the most used one because of it's raw damage.
I don't rock a shotgun this meta as they are not as powerful as in season one.
Currently the meta shifted to the light ammo gun buffs and they can stay out of range.
I did not include the mastiff (Golden shotgun)
This uses special ammo and has the damage to one-shot anyone close enough to you and is by far the strongest shotgun.
I recommend always taking this over any shotgun but don't wast your shots, it doens't use shotgun ammo.