fakeAsync vs await isStable

[hmil]

Trying to figure out which is best between:

fakeAsync(() => { 
  fixture.detectChanges();
  flush();
});

and

async () => {
  await fixture.whenStable();
}

Initial tests seem to point to the former, but the later might be cleaner as it doesn't mess with time (and allows complex test scenarios where it is necessary to manipulate time).