Our Oral-B Genius 9000 is a UK model and as this is not available in the US, it's not listed on our American website. However, I'd be happy to still explain the differences for you.
The only difference between the 9000 and 8000 versions is the colour of the handle and the difference between the 9000 and 9000s is the toothbrush heads that are included in the box. We do not have a 8000s available.
The 9000 comes with a Cross Action, Floss Action, 3D White and Sensitive brush head. The 9000s comes with 2 Sensitive, a Cross Action and a 3D White brush head.
Find out more about our Genius 8000 electric toothbrush model here.