Gypsum studs and gypsum channels are both essential components in constructing drywall partitions and ceilings, but they serve different purposes. Gypsum studs are also known as metal or steel studs. They are vertical framing elements used to create the skeletal structure of a wall or partition. They give the necessary support for attaching gypsum boards and ensuring the stability of the wall. These studs typically come in various sizes and are made from galvanized steel, which offers strength and resistance to corrosion.

On the other hand, hat channels are also known as furring channels or ceiling channels. They are horizontal framing elements used primarily in ceiling constructions and sometimes in wall assemblies. These channels help in suspending the gypsum boards from the overhead structure. They offer a flat surface for attaching the ceiling boards. They also help in leveling and aligning the ceiling, ensuring a smooth and even finish. Gypsum channels are also made from galvanized steel and are designed to interlock with other components in the ceiling system.

In summary, while both gypsum studs and gypsum channels are crucial in drywall construction. Studs are vertical elements providing structural support for walls. Channels are horizontal components primarily used in ceiling installations for alignment and support.