Sonic vs oscillating which type is better?

Neither is definitively better both are clinically proven to clean effectively. Sonic brushes (like Sonicare) vibrate side to side at extremely high frequencies and create fluid dynamics that help clean slightly beyond the bristle tips. Oscillating rotating brushes (like Oral B) spin and pulse to physically sweep away plaque. Some people prefer the buzzing feel of sonic, while others like the scrubbing sensation of oscillating. The best type is whichever you will actually use consistently for two minutes twice a day.