Form vs$.$ Function $-$ What do you consider more important?

Choose one or the other to defend. Talk about Tesla

Some marketers believe that product performance is most important. Other maintain that the style, look, feel, and other design elements of products are what really make the difference. Take a position $-$ Product functionality is the key to brand success OR product form $/$ design is the key to brand success. Select a company to help make your case. $($Provide at least one link to a professional or scholarly resource that helps support your opinion.$)$