I believe both. Not because they are my parents. But because they have more experiences in life than me. But most of the time I believe my father more than my mother esp. now.
Mom. She will tell what's on her mind. And what she believes is right. She will give practical advice because she believes practicality is the best option when deciding something. She never listen for other's opinions if she believe she is right.
Dad. He is opposite of my mom. Yeah, he will give practical advice too but he will add that it's still up to me is I'll follow his advice. And he listen to other's opinions. And he will decide base on the opinions of others.
That is why most of the time I believe my dad more that mom.