Zerodha any day over HDFC Sky having used both and closed sky in favour of Zerodha. Biggest pain with Sky is they spam you like anything - mail, message, WhatsApp, calls- horrible. I shifted to Zerodha -it is so peaceful now. Secondly their reports are all pain to understand and find. Though ICICI DIRECT is just superb in this, in discount brokers Zerodha is most peace of mind