What Falorb is actually for
If you are choosing between these, the deciding question is usually not privacy, because all of them take it seriously. It is how many sites you run and whether you need to know who somebody is.
Plausible, Fathom and Simple Analytics are deliberately aggregate-only. That is a genuine design position and, for a lot of teams, the right one: no personal data means far less to reason about. If that describes you, pick one of them and stop reading.
Falorb exists for the case those tools deliberately do not serve: several properties that share an audience, where the useful question is which of your products a particular person has used, what brought them, and whether they came back. That means person-level data on your own infrastructure, and the responsibility that comes with it.
Ten minutes to a real answer
Run it locally against your own traffic and compare the numbers yourself. Nothing to sign up for.