AC is more dangerous because the chance of a human suffering from Ventricular Fibrillation is much higher in the case of AC than DC. On the other hand, the impedance for DC is higher compared to AC so the harshness of electric shock would be comparatively lower than AC. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.