Question 1

Which is better, Oral-B iO Series 9 or Philips Sonicare DiamondClean Smart?

Accepted Answer

Both products scored 9/10 in our testing — it's a tie. Choose based on which features matter most to you.

Question 2

Is the Oral-B iO Series 9 worth it over the Philips Sonicare DiamondClean Smart?

Accepted Answer

The Oral-B iO Series 9 scores 9/10 while the Philips Sonicare DiamondClean Smart scores 9/10. The Oral-B iO Series 9 is our "Best Overall" pick in the Best Electric Toothbrushes Premium 2026 category.

Oral-B iO Series 9 vs Philips Sonicare DiamondClean Smart: Which to Buy?