Passing unique_ptr vs raw_ptr?

What is more common in your experience: func1() or funct2()?

void func1(unique_ptr<Bar>& bar) { /* alter pointed to object's attributes */ }

void func2(Bar* const bar) { /* alter pointed to object's attributes */ }

class Foo
{
  unique_ptr<Bar> bar;
  void mutate_bar1(){ func1(bar); }
  void mutate_bar2(){ func2(bar.get()); }
}