Hi @Sruthi17 ,

The Agent Workspace (Legacy) is one of the 1st workspaces within the ServiceNow platform, and will begins to deprecate  ahead of March 2024. ServiceNow's recommendation is that any new workspaces are created using a Configurable Workspace. 

HR Service Delivery Agent Workspace (Classic) is being prepared for deprecation. It will be hidden and no longer available for activation but will continue to be supported. For enhanced agent workspace experience, use the Agent Workspace for HR Case Management (Configurable). For details, see the Deprecation Process [KB0867184] article in the Now Support knowledge base.

Furthermore, the general difference is, that agent workspace was set upfor ITIL processes, where HR agent workspace is setup for HR related cases.

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Best regards

Anders