Do you think more people should listen to their mind or their heart?

My friend and I were having an argument on whether more people should listen to their mind or rather their heart. I think too many people let their mind get in the way of what their heart truly feels and that they should listen to their heart more. However, my friend thinks that too many people listen to their heart instead of their mind and end up getting hurt. I think it's because I'm a hopeless romantic and my friend is a realist that we feel this way but what is your opinion?