Electric, because my Dentist said they clean better than manual.
Although, I don't actually like it - not one bit. That vibrating effect through my head always makes me think of the times I've had my teeth drilled and filled so it's a very negative association.
And I always finish off with using a manual one. I don't think there's anything left on my teeth that needs cleaning off, but it's just a pleasant and calming action, for me.
Dentist advised a electric, yay all good, until my fillings started to come out........i know fillings arent good, but when they come out with an electric but not manual??
Remember Caz. Never argue with an idiot. They will drag you down to their level and beat you with experience.