The Commerce Server Product Unit is pleased to announce the release of our Microsoft Commerce Server 2009 Our commerce 2009 site has code offers
Free support ends in July for Microsoft Commerce Server customers
It came with a new, production-ready, out-of-the-box, contemporary website that allowed businesses to get their stores up-and-running and merchandise moving quickly.
I would recommend you to create the VS application
No new features are introduced in SP1.
Microsoft Commerce Server – Configipedia – BMC Documentation
From Microsoft: The Microsoft Commerce Server 2009 Template Pack for SharePoint 2010 contains a fully-featured and functional contemporary shopping Web site for use with Commerce Server 2009 that uses SharePoint 2010 as the presentation front-end.