There is no definitive answer to this question as it depends on the specific needs of the online store. However, some factors that could be considered include the following:
-Ease of use: The user interface should be easy to use and intuitive, so that customers can easily find what they are looking for and make purchases.
-Visual appeal: The visuals should be pleasing and aesthetically pleasing, in order to make the overall shopping experience more enjoyable.
-Functionality: The user interface should be designed in a way that facilitates easy and smooth functionality, in order to make the purchasing process as streamlined as possible.