Hi Nitin.
I am sorry, I am not trained in Smart Data Access. 
I am familiar with Oracle and SAP and with the tools that both company supported regarding the others.
I have only one small addition to this thread. Oracle 12c is planned to be released in Q1 2015 (see Development Update on scn.sap.com/community/oracle) so afetr the official release you could use 12c (incl. 12c Instant Client) without any restrictions I know.
Regards,
János