Confusion in the world or "Who's on first ?"
Motorola used to make a lot of this type of equipment. They were the one to invent the "Surfboard" model. Motorola as bought out by Arris in 2013. Because Arris bought all of the product already manufactured by Motorola they continued to sell product as Motorola Surfboard.
In 2019, Arris was acquired by CommScope.
You can find new/refurbished/used equipment with various labels on it, but the model number is the same. It was all manufactured under Motorola or Arris and has Motorola firmware inside.
For the most part, the''"se are still high quality, proven units.