To be worst ,now coinsecure site is down. Very poor performance. Don't consider Coinsecure at all.
In my honest opinion, for buying BTC, Zebpay always gives a better rate than Unocoin and deposits and withdrawals get processed within an hour if done between 9am and 8pm Monday-Saturday, also coinsecure gives the best rate if you want to sell Bitcoins. But, I have never used coinsecure, just compared rates. Looking at the reviews though, Coinsecure might take a week to deposit that money in your bank after you sell your BTC to them, if you want money the same day, always use Zebpay during their working hours.
The only downside is that Zebpay doesn't have a website, you have to always use their app, but actually that's more convenient.