Once I was present at a discussion between a seasoned quantum optics expert
and a group of aspiring physicists, and he asked us which interpretation
of quantum mechanics do we prefer. Some chose the standard Copenhagen interpretation,
others chose the Many Worlds interpretation, or an interpretation
with hidden variables, and so on. But just over half of those present agreed
on the standard interpretation.
And the expert agreed - why? Because, as he put it, everything that had ever
been done in the field of quantum physics had been done using the Copenhagen interpretation.
The way I see it, other interpretations have no purpose except to reconcile
what we observe on small scales with incorrect statements such as
"electron is a tiny ball", or "electron is a wave in the three-dimensional space",
or "an observer which are themselves composed of quantum mechanical particles
is independent of the system, and exerts free will to choose measurements
while the observed system is purely deterministic".