Better demat account?

I want to get a Demat Account for investment in Shares, Company Deposits, NPS and Mutual Funds. I have short-listed ICICI Direct Demat(asking to open Savings Account with them and deposit INR 25k)  and Kotak Demat(Already have savings account with them). The ICICI AMC offer better returns with there funds and NPS while Kotak lags behind. Can I invest in ICICI Debt and other wide range of products if invested with Kotak Demat?

And how is the management of NPS with Kotak or ICICI is better? And what about CD(don't want paper work while Investing and redeeming CD or Bonds)...