Only thing in favour of Z is trust. The day Z customers start trusting other brokers, like Finvasia, who are providing unlimited trading free of brokerage, that will the day when, Z client base will drop southwards. Many has already shifted from Z client base.
And as far brokerage is concerned, it is now on a very higher side considering monthly or free brokerage plans. You do 5 buy and 5 sell trades (very normal for a retail trader) and you have to pay 200 as brokerage plus taxes. On a volatile day, their trading apps or software go haywire.
Let God save Z clients.