It's difficult to say which is the best e-commerce site since it depends on the user's business needs and strategy. Here are a few popular platforms to get you started:
Shopify: Shopify is a comprehensive, hosted e-commerce solution. It lets you easily set up an online store, manage inventory, accept payments, and analyze data, with a wide range of features and customization options. Check out the Shopify features comparison chart to see which plan meets your business needs. https://www.shopify.com/compare
WooCommerce: WooCommerce is a free, open-source plugin for WordPress that lets you create an e-commerce store with powerful features. With flexible styling options, unlimited products, and multiple payment options, it's an ideal choice for businesses of all sizes. https://woocommerce.com/
BigCommerce: BigCommerce is a fully-hosted e-commerce platform that's designed to make launching an online store easy. It offers a range of features such as product personalization, pricing tools, and a point-of-sale system, along with plenty of integrations for payment processing and shipping. https://www.bigcommerce.com/
Magento: Magento is an enterprise-level e-commerce solution that covers everything from payments to product management and pricing. It's highly customizable and requires technical expertise, so it's best suited for larger businesses with dedicated IT staff. https://magento.com/
Ultimately, the best e-commerce site for you depends on your needs and budget, so it's best to research and compare your options before making a decision.