Throughout history in both Europe and the United States, many cathedrals were designed with variations of the Hammer Beam Truss. This design has a central arch and is more complex in nature than most other truss types. It lends a sense of old world architecture to the interior, and the style has a heavier, more massive feel than other truss designs.
One advantage of Hammer Beam trusses is the use of short members. It requires more components and time, but you are not paying a premium for long lengths of timber.