, the prescience is for the predators. The quad-gun is already twin-linked so prescience is redundant on the horrors themselves. I enjoy the flexibility of boosting the dakka pred or the AT pred depending on the situation.
But, more important than all that is having the unit survive the whole game so I can actually control a home objective. 2+ re-rollable is much more survivable than a 2+ and feel no pain. 1/36 chance to die vs 1/18. That's twice as survivable. Against S8 and higher it's even better as the plaguebearers lose their feel no pain, going to a 1/6 chance to die per wound. That's then 6 times more survivable.