Quality
Fiber lasers absorb much more energy than CO2 Lasers.
Raycus laser has been a popular brand name for laser source brands. It is used by many different laser cutter/engraver manufacturers. Raycus is mentioned in many places as you peruse the catalogs from different laser manufacturers. This is simply a sign that all the machines mentioned in this article have a Raycus Fiber Laser Technologies Co. Ltd. source.