laser engraving over other methods of applying the engraving are:

in the speed of the process, which significantly reduces its cost
no physical effect on the material that may allow engrave difficult and inconvenient location of portions of the material
the impact on the minimum surface area (about 10-20 microns), which affects the accuracy of the engraving
engraving process is defined and coordinated by the CNC, which allows almost eliminate marriage in products and achieves positioning accuracy within the details