Advantages of using AutoCAD WGM in Windchil

We store AutoCAD drawings in Windchill as wt.documents. Other than the option to do a check in directly from AutoCAD using the AutoCAD WGM what else are the advantages of using a AutoCAD WGM and managing the documents as EPM documents, over storing it as wt.documents?

We are evaluating on whether we should move to AutoCAD WGM and start managing these documents as EPM Documents or continue managing them as wt.documents.

Currently we are not using wt.parts but plan to use it in the future.