The first angle is the drilling angle. This is not new.
Then comes the pin-PAP distance. This is not new.
Then comes the pin-PAP line to VAL line degree measurement. This is remotely new.
To get the last angle, draw a line from the pin to the PAP. Then measure the angle to the VAL. A smaller angler will place the pin closer to the VAL, while a larger angle will place the pin further away.
Hope this helps. About "which is the best" or "what has been successful"...it really all depends. There is no "one" or "best" drilling. To each his own, my friend.