If a person buys a new truck, and is buying a new FW hitch, I would recommend buying a hitch rated to fit the truck's capability. No matter what FW you purchase, the truck will haul it, right up to the trucks rating.
A 16K hitch is enough for most any gas truck, and an 18K will cover most any SRW diesel. A 25K hitch will best serve a DRW diesel.
I would trust any of the B&W hitches, right to their max rating. I would not change out an 18K Patriot, that is already installed, if purchasing a FW that is nearing that weight.
Jerry