Degreeing Cam by Measuring Overlap @ Lifters

Yes.

LA Small Block Hydraulic Lifter Camshaft.

To be clear, I'm not looking for advice or how-to's just curious as to why there were two different methods presented for degreeing and how they compare.
I have one of those, it was in a core motor I was given. Truck cam.
I always use @.050 intake close.
Idk For people who like to do math?
To each his own.