I'll bite.

There are statistical studies in the US showing that female physicians make fewer medical errors than male physicians.  At the same time, male physicians see more patients.

It's reasonable to think that has nothing to do with biological determinism, but rather cultural factors -- maybe men measure success a little more by how much money they make while women feel successful a little more just by being doctors.

But as the example shows, it also depends on what you mean by "better."  I'd argue it's better to have both because, in this case, the females push up baselines for accuracy while the males push up baselines for efficiency, and as such, they both end up challenging individual physicians to aim higher.  That's why diversity matters.  It prevents any inherent bias of a non-diverse group from becoming normalized as good enough.  And Google knows it.