They were both smart. In my understanding, the mind is not only the ability to learn well or the presence of any knowledge. For me it is a special quality of mind that allows you to perceive and understand the world around us. The interests of the majority of people do not go beyond what everyday problems or already established opinions. In addition, not every teenager thinks about things that most people simply do not notice, even before they reach old age. From this point of view, Dylan and Eric definitely had a more open-minded than most of their peers. In the diaries of Rachel you can also see her ability to think deeply.
I just want something I can never have.