I will go for Zerodha becuase of free trades and great support.
You can read all about zerodha in brief in my website Home – Demat Guru and we also assist in opening account.
in simple terms I could say there are large number of clients in zerodha which shows trust and capacity.
There is no brokerage in Zerodha as compared to 5 paisa.
Zerodha has other products such as small case, Coin and other investment features.
Open a Trading and Demat Account through Dematguru and get additional benefits upto Rs. 2,000/- with no additional charges. Visit Exciting Offers On Opening a Trading and Demat Account – Demat Guru