Gateway Workflow Configuration OData

Hi

Just wanted to know which OData service is the correct one to configure workflows...

1. /sap/opu/odata/iwwrk/WFSERVICE;mo

or

2. /sap/opu/odata/IWPGW/TASKPROCESSING;mo

For generic workflow approvals, I used sap/opu/odata/IWPGW/TASKPROCESSING;mo and it was working.

I can see most if the entity types defined in both are similar. So is there any specific scenario where each one is used and what is the difference between those?

Thanks and Regards

Vidyadhar