The main difference between raised beds and planters is based on the presence of a bottom plate, the way they are modularized and the design will be the same. Raised beds are traditionally without a bottom plate as they are designed to be placed directly on the soil. This makes them ideal for extensive gardening where the roots of the plants can grow freely into the soil beneath the bed, providing better access to nutrients and water. Planter boxes have the option to add a bottom plate, which offers great flexibility. A bottom plate makes the planter suitable for use on terraces, balconies and other hard surfaces where direct contact with the soil is not possible or desired. This design limits root growth to the inner space of the box and makes it easier to control soil quality and moisture levels. Read more here.