The Glass is still widely used to produce horizontal surfaces of tables and shelves rather than vertical ones as Kitchen doors. Nowadays the more common is the "Float Glass" with light green shades and the "Extraclear" that's more transparent. The Mirror is more used for Vertical as Wall Mirror only or bonded/inserted on Furniture Doors.
Both are very versatile materials and can be Back - Decorated with Laquers - Etching - Sand Blasting, Screen Prints. On the Mirror we can also screen print the upper surface rather than back - engrave as we see in some of the Section Pics.