There is no “right” answer. You write an essay that adds to the overall picture you are painting of yourself as a potential student at your college: your stats frame the picture, your LoRs and ECs sketch the outlines and your essay(s) add the color. The more you know about what the school(s) who will read the essay are looking for the better, but at the end of the day the topic is you and the mark is ‘this student looks like a great fit for us’.
Pretty sure that won’t feel like a helpful answer, but it is a true one. Good luck 