Drygores stats vary more than you think. For the mainhand weapons the Damage for the Longsword and the Rapier are both 1102, while it's only 864 for the mace. However, they all have the accuracy of 2458. The damage sacrifice for the mace gives a +9 prayer boost instead. When it comes to the offhand weapons, the damage for the longsword and rapier are the same again, with 551, and then it's the mace with 432. They all have 2458 accuracy again though. The offhand mace offers no prayer bonus though.
Because I don't use prayer it's a toss-up between the rapier and the longswords, as they are both the same.