Ankur,
For each screen set, the client will report it's platform and the Agenry server will determine based on the available platforms in the Screen Set and the platform priority defined in the screensets.ini which platform to send to each client. A client will only get screens associated with one platform within a given screenset.
In this case you will need to evaluate what works best for your devices and decide the appropriate resolution to use for each and then configure screens accordingly.
--Bill