There is no one-size-fits-all answer to this question as the best website builder for an online store depends on a number of factors, such as the size and complexity of the store, the budget, and the level of technical expertise of the store owner. However, some website builders are better suited for online stores than others.
Shopify is a popular option for online stores as it is easy to use and has a wide range of features and plugins to choose from. For a more complex store, WooCommerce is a good option as it is a powerful eCommerce plugin for WordPress. Squarespace is another popular option for online stores as it offers beautiful templates and an easy-to-use drag-and-drop editor.