Video: Powder compacts | Drugstore vs High-end

When it comes to face powder, how much should we pay for our face powder? where and when do we use a face powder compact?
I am trying to compare two products, one drugstore and one high end.

Maybelline Wonder Powder
Physicians Formula magic mozaic
Physicians Formula Translucent powder

Guerlain mythic voyage compact powder
Guerlain Bronzer Powder
Guerlain Les Voilettes Face Powder
Guerlain Joli Teint Powder

Guerlain Mythic voyage powder: Météorities Voyage is a refillable pressed powder compact with a universal harmony of corrective and illuminating shades that adapt to a range of skin tones. The universal shade corrects and illuminates the complexion with ultimate radiance. Its refillable case holds a blend of five different micro-pearls, hand-made and compacted by Guerlain's craftsmen. White reflects light, Purple captures light, Green combats redness, Champagne illuminates and Pink reveals a glowy effect. Its new case is beautifully decorated with a new ultra-resistant silver-colored Zamak lid. It is an essential gem to give or to keep.

How to use: Apply with a brush evenly to the entire face to fix makeup and improve hold. For a greater boost of radiance, highlight the cheekbones and other prominent parts of the face. Trace a "G" from the center of the forehead toward the top of the cheekbone, then from the bridge of the nose toward the chin.

By Guerlain; made in France.
Maybelline powder: This Maybelline Dream Wonder Powder glides on soft and smooth for flawless coverage that isn't cakey or chalky. Includes an applicator and interior mirror.

Allergy tested
Suitable for all skin types
Glides on soft and smooth
Skin-perfecting silky finish
Buildable medium coverage