Reading existing threads helps a lot and saves time. Read following thread, this should answer your queries:
https://bitcointalksearch.org/topic/best-and-worst-bitcoin-exchanges-around-india-1673156
A useful thread for newbies in order to get a good exchange for selling and buying.
I think most of the people voted for coinsecure because of the exchange rates it provide. But I would say Zeb is better for me, faster kyc approve and even bank transfer take 24 hours maximum. Coinsecure take lot of time in kyc approve.
zebpay is good when it comes to kyc and technical support if any issue is observed with purchase and sell. They really know how to keep customer happy. The time it takes to purchase bitcoin is bit slow and delay is quite observable when withdrawal is requested.