You should consider coinsecure over zebpay
Reason 1- the difference in buying and selling is at same rate in coinsecure while there is a difference of almost 7000 rs in buying and selling price on zebpay

Reason 2- you can view the live exchanges/trading on coinsecure and not on zebpay

My personal experince in terms of UI and sign up process has been almost same in both the sites, but make your decision after visiting and reading the content on both sites. Good luck !!