When choosing the size of a custom rug online, it is better to be too big rather than too small. An oversized rug anchors the room defines the space and creates a more cohesive and visually appealing look. It provides a sense of luxury and comfort underfoot. On the other hand, a rug that is too small may make the room feel cohesive and complete. Ideally, a customized rug should be large enough to accommodate the key furniture pieces in a room, allowing for a balanced and harmonious design.