Which is better the diamond clean sonicare or the healthy white sonicare?

Both good: I prefer the ergonomics of the diamond clean, but both are great. Just remember to change the heads out often and consider the model with the uv sanitizer.

Features: they are VERY similar in what they are doing clinically-- one does have more fun features than the other, but both will do an excellent job cleaning your mouth.

No difference: Both brands are the market leaders and both have been around for many years and FDA approved. The only difference is HealthyWhite features a dedicated whitening mode.