One of the first things you will have to ask yourself is where you will be placing your dining table. A round table curiously seems to draw all elements that surround it towards it, thereby anchoring itself (and the chairs) visually more than a rectangular table would. It also takes up less space.
One point to keep in mind when choosing a table is how it will influence the social factor of your dining room. A round table is perfect for when you want to encourage conversation around the dining table. Also, it doesn’t allow anybody to sit at the head of the table, which is perfect for when you want to avoid any type of hierarchy.The same is true for square tables; however, square tables take up more space than round ones. And for the same number of diners, it’s better to opt for a rectangular one, as it offers more seating areas.