It's all in the style! Both beds are available in the same, quality fabrics, with our orthopaedic & memory foam crumb inner cushion. The Mattress Bed has a squarer edge to the bed and are 'true-to-size'. The Pillow Beds have a softer, rounded edge, like a scatter cushion or bed pillow. The inner cushions for these beds are therefore different so please bear this in mind if you need to order replacement covers or inner cushions.