The benefit of upgrading to the newer WD Media Server is to gain full Windows 8 certification and to take advantage of WD’s app for Windows 8. The patches (provide in the KBA link below) offers the choice of using either DLNA server, and the option to switch back to the other server by simply applying one of the patches.
Note: To try the WD app for Windows 8, go to the Windows 8 app store and search for WD. To enable full functionality of the WD app for Windows 8, you must apply the firmware version 02.41.05-034 update first. Go to the WD KBA #5735 link provided below to learn more about, including how to download the patch.
KBA# 5735 Link: http://wdc.custhelp.com/app/answers/detail/a_id/5735"