ameet, you might find this of interest:
http://www.airservicesaustralia.com/...Flight_Ops.swf
For the controller there's little difference between using radar & ADS-B - both require line-of-sight so have similar range. We can use 5NM & vectors for both.
On screen the surveillance hierarchy is SSR, ADS-B, ADS-C so if more than one is available you only get the symbol for the highest available type.
When in both SSR & ADS-B coverage we get an indication in the label to show this so that when SSR coverage runs out you know whether you can still run the same surveillance standard or have to revert to procedural.