Multiple technologies, different results. BEAMZ Laser Engraving uses different systems to achieve results on a wide range of materials.
The CO2 laser uses frequencies of light that interact with organic materials like wood and glass.
The fibremark laser uses frequencies that react with metals and dark plastics even when they are not coated as is required with the CO2 lasers.
There are differing machine configurations too! Many of the laser engravers around today are "beam and carraige" units, meaning the laser is focused through a lens mounted on a set of beams that move over the work area. There is another type called a "galvanometer", where the lens is stationary over the work area and the laser beam is directed over the target material using mirrors controlled by the guidance system. Although the galvanometers can be faster, they generally have a more limited coverage area.