A friend just called from a store to ask what's the difference
(practically) between a cut resistance 8 versus 9 in a Master Padlock.

Two #9s are $19, while a similar set of four #8s for $25.

From a practical standpoint, do you have any experience to share
to help drive one to that type of decision?

Note: I will google but she's on the line now!
(and, I know nothing about this stuff)