I am in the Grendel crowd. I think target shooters are going to prefer the ARC for long range shooting; ARC ballistics are better than the Grendel. However, it's hard to beat the Grendel for pigs and predator hunting. I do not speak from any experience with the ARC. I hear of some Grendel shooters who have had some fun shooting the ARC, but they prefer the Grendel for pigs. The extra bullet weight of the Grendel is preferred.