Laced-in floors are more expensive, drain faster and are easier to take out if they need repair. In some cases simply a measure of elbowroom. This varies by size of the craft and between manufacturers' styles. Coating determines the boat's air retention and abrasion and UV resistance, and a boat's material is usually referred to by its coating. Base fabric is usually nylon or polyester and determines tear strength and puncture resistance.
Some companies even use a separate aircell with a watertight skin.
However, denier alone doesn't determine the tightness of the weave or the tear or burst strength of the fabric. Type, size and weave of fabrics vary, and be aware that not all Hypalon, PVC or urethane boats are alike. Material from each manufacturer is a little different. A plastic that is usually heat-welded instead of glued. A tougher, more durable and abrasion-resistant member of the plastic family.