I believe there is no one thing such as holy grail which works all the times and can be called as most accurate in markets.You can try any of the above and fix to one which suits your trading style.

Pi uses standard formula with the below expression.

R3 = H + 2( Pivot - L
R2 = Pivot + ( H - L )
R1 = ( 2 x Pivot ) - L
Pivot = ( H + L + C ) / 3
S1 = ( 2 x Pivot ) - H
S2 = Pivot - ( H - L )
S3 = L - 2( H - Pivot )

Does kite run on a different formula?? I tried calculating the Nifty futures on 22nd Dec and the result I got was different from the one shown on kite…

Shiva, there is 5 different kind of pivot points. The classic pivot, the camarilla pivot, the woodie pivot, the fibonacci pivot and the de mark pivot. 4 out of 5 of them are covered in this pivot point calculator. The full trading strategies are also provided. Can have a look.