Is Braun Shaver Series 9 better than Series 8 vs Series 7?

Braun Shaver Series 9
See On Amazon (US)► https://www.taquocthang.com/b01m716cc2
See On Amazon (CA)► https://www.smartsproduct.com/b01m716cc2

Braun Shaver Series 7
See On Amazon (US)► https://www.taquocthang.com/B01MPX171W
See On Amazon (CA)► https://www.smartsproduct.com/b01m716cc2

About this item
World’s most efficient electric shaver . Efficient, close and gentle, for a flawless shave
Best efficiency: 5 shaving elements get more hair in one stroke than any other shavers
Best for gentleness: sonic vibrations glide over your skin for maximum skin comfort
Use wet or dry. Now with 20% more battery power
Product designed, engineered and made in Germany. Recommended by GQ and the Skin Health Alliance accredited
Tested on 3-day beard vs. leading premium tier products. vs. previous Series 9"