Best indian accounting software

I am Chartered Accountant currently not in practice but have an idea to set up a professional practicing firm in the future. I believe that accounting software is a must for a CA firm, which is the reliable and best accounting software currently available in the market, is it Tally 9 ERP. My uses include, accepting accounting outsourcing assignments of clients (their specific requirements can be for submitting documents for tax purpose or sales tax purpose) and for recording my firm's daily transactions.