Determining the best site for e-commerce depends on various factors such as the specific needs of the business, target audience, budget, scalability, and desired features. However, there are a few popular e-commerce platforms that are widely recognized for their capabilities and user-friendly interfaces. Here are three top contenders:

1. Shopify: 
Shopify is one of the most popular e-commerce platforms, known for its simplicity and flexibility. It offers a wide range of customizable themes and templates, making it easy to create a visually appealing online store. Shopify provides an intuitive admin panel, allowing users to manage products, inventory, orders, and payments efficiently. It also offers various integrations, including social media, email marketing, and analytics tools. Additionally, Shopify provides excellent customer support and has a large community of developers and experts who can assist with any customization needs.

Example: Allbirds, a sustainable footwear brand, uses Shopify to power its e-commerce store. They have successfully utilized Shopify's features to create an engaging shopping experience for their customers.

Reference: https://www.shopify.com/examples/allbirds

2. WooCommerce: 
WooCommerce is an e-commerce plugin built for WordPress, making it an ideal choice for businesses already using WordPress as their content management system. It is open-source and highly customizable, allowing users to modify their online store to suit their specific requirements. WooCommerce offers various extensions and themes, providing flexibility in design and functionality. It also integrates seamlessly with popular payment gateways and shipping providers, making it easy to handle transactions.

Example: Porter & York, an online butcher shop, uses WooCommerce to power its e-commerce platform. They have leveraged WooCommerce's features to create a user-friendly interface for customers to order high-quality meat products.

Reference: https://woocommerce.com/showcase/porter-york/

3. Magento: 
Magento is a powerful and scalable e-commerce platform, suitable for businesses with complex requirements or large catalogs. It offers a wide range of features, including advanced product management, multi-store capabilities, and robust SEO options. Magento provides extensive customization options, allowing businesses to create unique and personalized online stores. It also integrates with various third-party services and has a large community of developers for support.

Example: Coca-Cola, one of the world's largest beverage companies, uses Magento for its e-commerce platform. With a vast product catalog and global reach, Magento's scalability and advanced features have helped Coca-Cola manage its online sales efficiently.

Reference: https://magento.com/customers/coca-cola

Ultimately, the best e-commerce platform will depend on the specific needs and goals of your business. It is recommended to thoroughly research and evaluate each platform based on your requirements, budget, and long-term growth plans before making a decision.