The stock (or lack thereof) has no bearing on the manufacturer. You chose the model with the pistol grip. How that reflects on the manufacturer choice is beyond me.
Don't buy into the pistol grip hate because of what you hear. At least hate it because you've tried it and found that YOU hate it. It's a 15 dollar part than can easily be removed, traded and/or sold away. The consensus is GENERALLY right if not a little overblown. The weapon can indeed be used and relied on, but it takes a lot of practice and definitely befits a hearty individual. If the gun's intended for the homestead (10-15 yards and less), it can be wielded decently with a good amount of practice. Buy a ton of birdshot and as many rounds of the cheapest 00 buck you can find and practice up. Start with the birdshot and get used to handling, aiming positions and follow up shots. Keep the dang gun under your chin line at ALL times, no exceptions. Then go to the buck on threat-sized targets at 15 yards and see how you do. I can tell you, like I said before, that Mossberg factory grip is gonna beat your hand up worse than Mickey Rourke in The Wrestler. Only until I'd put about thousand rounds total through a PGO with three different brands of pistol grips, both through an M500 and an 870 Wingmaster, did I come to an impartial and judicious decision regarding them, and now an m500 18.5" with Hogue pistol grip rests beside my bed, cruiser-ready as the go-to regarding my home and personal defense. It's just that a DEFENSE gun. Not offense, not slug. Up-close-and-personal-please-put-the-knife-or-25caliber-away-and-leave type of deal.
If you guys have 20" cruisers and are looking for a full stock on the cheap, I'd look on Numrich and Havlin. If you opt for a synthetic, the forend doesn't really need to be switched out. The factory synthetic Mossberg is about the most durable and positively-gripped forend I've found.