Ready to use standard eCommerce modules and plug in. Unlike other Content management system where plug in needs to integrate for commerce features, Magento comes up with ready to use modules and plug in like inventory management, customer segmentation, chart, dashboard, advance supplier and shipping options and lot more.
It might be a separate discussion point between experience and attitude and what to choose. It depends upon the project time and quality. It is advisable to go for experience of minimum 3 years if your project is medium to large size. For small work or update work it is OK with less experience WordPress developer.