Hello Pooja,
My personal suggestion is to use IDM.
Even our own SAP IT moved from CUA to IDM for several reasons - easy maintanance, better provisioning and simplified maintanance.
IDM 7.2 goes with GRC integration framework that works like charm and many more other connectors for both SAP and non-SAP systems, so it would be easier for you if you will have to integrate with another system in the future.
Regards
Todor