The “succulent container” usually refers to a potpourri-style in which many types of succulents are combined in a single pot. In these cases the result is often an unruly competition between them, with some growing faster and some growing over other.
Another style, shown here, is to grow all the same species in a single container. This produces a different visual effect, I think, where the many combine to create a single ‘plant’. Another benefit is that there’s no real competition – and some succulents that are not so great visually in a single planting look good when grown en masse.