One piece toilets have a seamless body that is easier to clean and looks more premium, which helps at retail. They are heavier and take more freight volume per unit.

Two piece toilets ship in separate cartons, lowering breakage risk and freight cost per set — a strong choice for economical project orders and long-distance markets.

For most distributors the answer is to stock both: a one piece line for showroom and premium retail, and a two piece line for value and project tenders.