From my personal experience, I would say the PrestaShop One Page Checkout addon by KnowBand can be the best fit for your e-commerce store.The sole purpose of using a one-page checkout is to improve or simplify the checkout experience of online shoppers. Unlike a multi-page checkout where a user has to go through a number of steps before finally placing an order, a one-page checkout makes it a one-step process.This checkout module makes sure that your customers enjoy a seamless shopping experience. It helps you get rid of the clunky elements from the checkout page. It offers-1. Guest checkout- Allows a person to checkout without getting registered on the store.2. Social login- Lets a user sign-up with their Facebook or Google account.3. MailChimp, SendinBlue, and Klaviyo Integrator to collect emails of the subscribers directly in these accounts.4. Supports multiple payment methods and shipping services5. Set payment options for a particular shipping service6. Drag and drop- Lets you sort out the checkout fields based on your priority.7. Multiple layouts- Provides 3-layout designs: 1-column, 2-column and 3-column.8. Google Auto-address fill9. Inline Validation- Displays error in real-time if the information entered is correct and green tick if the provided information is correct.10. GDPR compatibleTry out this module and I assure you that your search for the best one page checkout module will end here.Let me know if you have any query related to this module.