The IKEA potty seat that sits on top of an adult toilet is a long-time favourite — durable, easy to clean, and used by many families for 2-3 years. The Luvlap floor potty is comfortable and its top seat doubles for travel on regular commodes. For portability, a foldable seat that fits on standard toilets is convenient. Some floor potties run small, so check sizing if your toddler is on the larger side.