Depends what it's for. A square lap quilt is sometimes too wide and not long enough. I make a square for my bed so there's enough hanging over the side . I wouldn't make it a rectangle - or a square - just because you think it should be, unless it enhances the over all design. That is, I wouldn't make a square quilt into a rectangle, if the square functions for what you need, unless changing it to a rectangle would make it better.