One determining factor in selecting the right water flosser for you and your family is size. If you have lots of space on your bathroom vanity, the sky’s the limit on how big a unit you can fit there without causing space problems. On the other hand, if you live in an apartment, have a small vanity or like to always have your vanity cleared completely off when you are finished brushing/flossing, a cordless model will fit your needs better since you can put it in a drawer or cabinet. Closely related to size is portability, which depends largely on whether the water flosser is a countertop model or cordless. Of course, a countertop model will always be right there when you need it with no looking or searching through cluttered drawers. However, a cordless water flosser is very handy if you have to travel a lot and want to take it on the road with you.