What is the difference between gatorboard and ultraboard?

Ultraboard is a durable material that has a plastic front and back with a foam center. It is very durable, and rigid and is designed for interior, long term use. Gatorboard is very similar to ultraboard in terms of durability, also intended for interior long term use. The faces of gatorbaord are made of a wood-fiber veneer. Ultraboard plastic faces provide durability against dents, and other impacts.