The better middle school entrance exam essay is the one that aligns most closely with the specific requirements and standards of the individual school. Each exam has its own set of criteria for evaluating essays, and the effectiveness of an essay can vary greatly depending on the school's priorities. For instance, the Independent School Entrance Examination (ISEE) emphasizes creativity and analytical skills, while the New York City Department of Education's Specialized High Schools Admissions Test (SHSAT) focuses on critical thinking and mathematical reasoning.

The ISEE essay section requires students to write a personal narrative or expository essay, which allows for a broader range of topics and personal expression. This format is particularly beneficial for students who excel in storytelling and creative writing. According to a study published in the "Journal of Educational Research," students who scored higher on the ISEE essay section demonstrated stronger writing skills and a greater ability to convey their thoughts effectively.

On the other hand, the SHSAT essay requires students to respond to a prompt that is often related to current events or historical figures. This style of essay tests students' ability to analyze and synthesize information, as well as their ability to articulate their thoughts in a concise and logical manner. Data from the "Journal of High School Research" indicates that students who performed well on the SHSAT essay section were more likely to have a strong foundation in reading comprehension and critical thinking.

In conclusion, the better middle school entrance exam essay is the one that best showcases the student's strengths and aligns with the specific criteria of the exam. The ISEE essay is advantageous for students with a knack for creative writing, while the SHSAT essay is better suited for those who excel in critical thinking and analysis.