Sylius offers a flexible and customizable eCommerce platform built on Symfony2, a well-known PHP framework. It is preferred by those who appreciate an open-source approach, providing users the freedom to modify and adapt the software according to their unique business needs.
Key features of Sylius include its full-stack functionality, meaning it provides end-to-end solutions for online commerce activities. This includes product management, order processing, and customer relationship management. It also boasts of a robust plugin system that allows for extensive customization and integration capability.
Moreover, being open-source makes Sylius highly versatile. Users have access to the source code enabling them to customize the software as per their business requirements. And because it's built on Symfony2, users can benefit from the framework's speed, flexibility, and reusable components.