I had a Mossberg 590A1 with a traditional stock, and front rifle sight/rear ghost ring. I still have the Remington 870 Tactical with the pistol grip stock, and a bead sight, drilled and tapped receiver.
I prefer the 870 Tactical because of the pistol grip. I also like that the 870 Tactical is drilled and tapped, and the barrel has a bead front sight...no snags.
That said, the 590A1 now is offered with the identical pistol grip as the 870 Tactical. Still don't care for the rifled sights of the 590A1. The fit and function of both was equal, and equal quality.
Fire both, take the one that fits you physically.
Geno