Oral-B iO Series 9 outperforms on brushing coverage tracking per independent tests from Consumer Reports while Philips Sonicare DiamondClean 9000 provides longer battery life of 3 weeks versus 2 weeks. The iO's magnetic drive reduces gum irritation more effectively according to dental studies but Sonicare includes a USB-charging travel case. Oral-B takes the win for users prioritizing feedback ...