You are comparing a grafted apple to something on its own roots. Not a valid comparison.
Is M9 stronger, on it's own, in some locations than it is in others?
Yes, you even admit the variability.
Is it different than just about any other of the couple thousand named apple varieties...yes.
Do all of those do well everywhere? No.
To make the list meaningful, you need to break it down and get as specific as possible. It needs to, minimally be segregated by climate zone/conditions, but region, soil type and a few other items would make it even better.