Braun Oral B here, changed over about three years ago and it made a huge difference to cleanliness.
I'm under specialist dental care at Guys Hospital (long story but treatment has finished now) and they recommended this toothbrush.
Used in conjunction with a fluoride mouthwash such as Colgate Fluoriguard itreally can help preserve the life of your molars.
And they're only about twenty quid in supermarkets, though the heads are relatively expensive.