According to Kirkilas, both seats and chairs are useful in facilitating the potty training process. In his experience, however, he has found that potty chairs may be easier for a child to get used to at first. "The chair allows their feet to touch the ground, which may make them feel more secure and can also be placed in convenient locations outside of the bathroom, such as play areas, as easy access is critical to success when they are getting started," he says.
Once your child has gotten used to using the separate potty chair, over-the-toilet potty seats work well in helping them transition to the toilet. As an added plus, potty seats tend to be easier to clean that potty chairs.