FTP Attachments® Pro differ from Basic version by providing following features -

• Maintain Document version.
• Access history of all attachments.
• Restrict/Allow duplicate file names and extensions.
• Organize attachments in folder structure.
• Send Email from within Salesforce with FTP Attachments®.
• Web Service API to integrate with other applications.

For detailed comparison please visit our site http://www.ftpattachments.com .