In my experience, factory authorized service agents service rates depend on brand. Independent service agents, do not. Dealers in my area who have in house service, are also more than happy to send watches to the factory to be serviced. In some cases lack of access to parts forces them to do so. In house service rates depend on complications and the movement, not brand. I generally avoid any service providers who do not do regular service work in house. There is zero value in my experience in putting a middleman in between you and the person/company servicing your watch.