Generate a full, in-depth guide for entrepreneurs on how to choose the right e-commerce platform. The guide must be analytical and easy to compare. It must include: 1. A detailed breakdown of the pros and cons of major platforms (Shopify, WooCommerce, BigCommerce). 2. A section on key decision-making criteria (e.g., pricing, scalability, ease of use, integrations). 3. A checklist of questions a business owner should ask themselves before making a choice. 4. A discussion on headless commerce for advanced users. Please include a disclaimer that the 'best' platform depends on specific business needs.