Our Heart or Our Mind? Which is more complicated?

This question pop up on my mind today... Well I was at home slacking out.. I had to take urgent leave to babysit my nephew as my mum had something to do and could not watch my nephew.... Was on msn chatting with my friends... This thought came to me... Many say the mind is a complex organ...It creates thoughts, dreams and memories... What about the heart? It plays a whole different role... But it causes desire.. Both are just as important and neither can be considered more superior to the other. Without the heart, the brain dies and without the brain, the heart loses it purpose. but who should be the better judge... Problem we follow our minds..Dreams who follow our heart.. What about love? Should i listen to my heart or mind?