just wondering~ :3
Sentenza or Argent Peacemaker
To be honest don't go with the Antigua lines, the split damage makes them a poor choice of a weapon.
If you absolutely HAVE to get one, then get an Argent Peacemaker because it will good against Undead and Fiends which are ideal for shooting, compared to being good against Beast and Gremlins (Sentenza) which dodge your bullets cutting the DPS down by a lot.
Also a Sentenza will do the same damage against Vanaduke since he is slightly weak against piercing and slightly resistant to all other types, but people use the Argent Peacemaker since Citadel is full of undead and his minions are undead as well. Callahan will do the most damage as a gun against Vanaduke since it is pure piercing, gaining the full damage bonus against him.
Tairy is right; Peacemaker is really only useful in the firestorm citadel. Sentenza is not useful anywhere.
But they do look cool.
Peace is generally regarded as the better choice given the enemies it has bonus damage to.
Most importantly Sentenza deals half of Peace's damage to Vanaduke, the strongest boss in the game yet.