Someone that is governed more by intellectual decisions than emotional decisions would be a scientist or an engineer.
There are both positive and negative sides to relying more on your intellect than you emotions. If you rely on your intellect, then you will do what is best for you, not what you feel is best for other people. Some people may rely too much on intellectual decisions, making them seem basically emotional.
 It helps to sometimes make emotional decisions because emotions help you feel comfort with other family members and friends.
If you make too many intellectual decisions, then you will most likely be shutting out the people in your life. In some situations following your head is the right thing to do, but you may want to follow your heart because it's what feels right.