Surfboards are not really bought by brands. Yes, they are marketed that way, but surfers usually are not that tied in or loyal to brands. They will shop for a board by looking for a certain shape that appeals to them, and when they fall in love with a certain board in the stand, they grab it and go, maybe not even paying much attention to the decal on it.
There is a wide range of windsurfing accessories on the market, some of which are essential. The use of a mast is not mandatory, but it provides maximum comfort for the surfer: it relieves the tension of the athlete's arms, evenly distributing the load throughout the body, see it here https://easy-surfshop.com/do/cat/windsurfing-masts/Windsurf-Masts . Whether you're just starting out or an experienced surfer, you'll definitely need the following accessories.