Sitecore Experience Commerce 9 Features

• User-friendly business tools
• Microservices architecture support for catalog, customer profile, and inventory
• Fully supported SXA Storefront
• Unified, faster, extensible business tools
• New and improved inventory features
• Additional support for multiple currencies, warehouses, inventories, and stores
• Simplified catalog manager
• New migration tools for catalogs and profiles
• PaaS support

Reference:

https://www.sitecore.com/resources/index/white-papers/why-invest-commerce