The iO Series 9 outperforms the Genius Pro 8000 in plaque removal (Consumer Reports) and offers a smoother magnetic drive (TechRadar), making it the stronger choice for performance‑focused users. However, its higher price and steeper learning curve may deter budget‑oriented buyers, who will find the Genius Pro 8000’s smart feedback sufficient. Overall, the iO 9’s advanced features and build qua...
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