Choose based on your room shape and how you use the space. Rectangular dining tables suit long or narrow rooms, maximising space and offering flexible seating. They work well pushed against walls when needed. Round tables suit square rooms and encourage conversation, though they're less space-efficient in rectangular rooms.
A small rectangular dining table fits compact spaces better than round alternatives of similar capacity. Rectangular tables accommodate extra guests more easily with additional chairs, while round tables create a more intimate, sociable feel for smaller gatherings.