What are the difference between Sensorless-1 and Sensorless-2 for the iS7?

What are the difference between Sensorless-1 and Sensorless-2 for the iS7?

The main difference is the method which is used for the Speed Estimation.  For higher torque or more precise applications, it is recommended to use Sensorless-2
  1. Sensorless-1 estimates the motor speed with a simple equation.
  2. Sensorless-2 estimates the motor speed with Flux estimation which use the Stat