From my perspective as an employee of an OEM, finding the boxes is incredibly important. National or Manufacturer prestige is secondary to determining the cause. There is so much more at stake.
Also, since it will likely come up, in my two plus decades of experience, there is no personal animosity between the two primary OEM's from honorable employees. While there is pride in our respective products, there is also a mutual respect, as well as sympathy when the other has an event.
I've found that the A vs. B arguments -as a rule- are not instigated from folks who actually work for A or B, rather, they are championed by those who have very little, if any, "skin in the game" and are generally dismissed by those of us who do.