Deterministic
Precise where it can see, blind everywhere else. Good for the last step, poor for the screens that created demand.
Probabilistic
Fills the gaps, at the cost of certainty. Useful for direction, dangerous when quoted to two decimal places.
Test and learn
The closest thing to proof available, and the most often skipped because it takes planning.
Using them together
Each method is a different instrument reading the same system. Agreement between them is the signal worth acting on.