Oral-B iO7 vs Oral-B iO9: Which smart electric toothbrush is best?

They may be made by the same company, but these models offer different teeth-cleaning experiences  

Oral-B Electric Toothbrush Comparison (Chart Included)

Oral-B iO Series 4 vs 5 vs 6 vs 7 vs 8 vs 9 vs 10 comparison

Oral-B iO Series 9 review

Oral-B iO Series 9 Rechargeable Electric Toothbrush, Aquamarine with 4 Brush Heads and Travel Case - Visible Pressure Sensor to Protect Gums – 7 Cleaning Modes - 2 Minute Timer : Health & Household

Oral-B iO Series Comparison

Oral-B IO7 Electric Toothbrush Rechargeable 3D Visible Timer Teeth 5 Modes Replacement Brush Head Magnetic Charging Travel Case

Oral B iO Series 7 Smart Electric Toothbrush 3D Teeth Tracking Brushing 5 Mode Pressure Sensor Ultimate Clean Replace Brush Head - AliExpress

2 Oral-B iO Series 7s Electric Toothbrushes, 3 iO Ultimate Clean Brush Heads, 2 chargers, and 2 travel cases 5 Smart Modes for personalized brushing

Oral-B iO Series 7s Rechargeable Toothbrush with 2 Handles, 2 Chargers, 3 Brush Heads and 2 Deluxe Travel Cases

Oral B iO9 Smart Sonic Electric Toothbrush Teeth Whitening Dental Automatic Brush Micro-vibrating Tech Rechargeable Travel Box - AliExpress

Best Oral-B Electric Toothbrush: Which Oral-B Brush Should I Buy? - Tech Advisor

Oral-B iO7 vs Oral-B iO9: Which smart electric toothbrush is best?

Oral-B iO Series 7 (iO7) Review