Who is the best stock broker in the country?

Sharekhan? Karvy? Zerodha? Icici direct? Hdfc securities? Motilal Oswal? Bajaj? Kotak Mahindra? India Infoline? Indiabulls? Angel Broking? Reliance? Aditya Birla?

If you feel any one of this is the most trusted or reliable or prominent one.
Which one??
And why??
Explain?

I think karvy and sharekhan are very old ones started long back. But sharekhan is better now. My personal choice is always Zerodha.
The reason for it is that their approach towards custumers is good and caring. Also can appreciate their low brokerage fee 20 bucks. They started not so long but already in the top of the pyramid. I will go with zerodha.