They aren't in competition, just two different tools that you use to make the best decisions. Emotions are information about how you are relating to yourself/others and your situation and you use them and your head/logic to see if you can make a decision/action so you'll feel better and whatever situation is bothering you will get resolved easiest. When your head says one thing and your heart another, you look deep and see what you really want, what would help you the most and make a plan to go that way. You're only in charge of you and doing what you want/helps you survive and thrive (making sure to try not to deliberately hurt others).