Both are useful in 2 diffrent but. Important ways. The heart keeps the brain alive and the brain makes d heart useful.if ur heart beats and u are brainless u are as good as a vegetable.And if u have a brain without a heart u are as good as death. I will therefore say only a heart can keep a brain running .
The heart is more important than the brain because without heart their won't be life to live, you can still live without your brain functioning well but if there is no heart to perform it duty (pumping blood to other organs both brain)the blood won't circulate and any organ without the reach of blood by the help from heart become lifeless both the body and the brain. With this you understand and believe that heart is more important than heart
They are both vital organs in the body,without one,the body will not function properly...The heart is to the body what engine is to machine,it supplies blood to all parts of the body including the brain,and the brain can't function without blood.Therefore the most important organ is the heart.