Looking at the following two photos, it is a little difficult to decide which is a nicer photo.
With raw format, I can always tweak it if I change my mind. But I don't bother. This photo, I set it to "Auto" white balance.
This one, the white balance is set to "cloudy". See, one is bright red and another is more bluish. Which one is nicer? I know that there is a difference in opinion. No one is right.
I heard one pro who said that he can't understand why we paid for advance technology and yet we want to perform manual adjustment/setting. Just set everything to "Auto" but you do need to ensure that the correct "Auto" is selected.