I have seen far too many posts about how some pretty girl has very bad behavior, either domestically or when they are out in public. I know for most people, having a good-looking partner is some kind of achievement, and that makes sense because no matter what, we are a social creature that would be attracted to a pretty face.
But in reality, sometimes it is ok to just go with someone who has a good heart rather than the one who has a beautiful face, because sometimes having mental peace is much better than the ego of having a pretty partner.
Someone who has a good heart will hardly make any commotion because he/she feel offended by small things in your life, or make a big issue over small things in public that might get you in trouble, or at least put themselves in a hot spot for people to look at.
So yeah, sometimes it is better to choose someone with a good heart rather than someone with a good face but bad heart.