AP Psych or Writing Center?

Hi,

I’m currently a sophomore attending both a regular public school and a STEM magnet. In my regular high school, there is something called a Writing Center, where selected students edit the essays of other students and basically tutor them. It is an unweighted class. I have been nominated to become a Writing Center tutor, but I’m wondering whether I should do that or AP psych…

I love psychology. I also love writing. Ultimately my college major will be in the sciences. I am hoping to attend a very selective school - I have a high GPA and strong extracurriculars, as well as a strong relationship with some teachers. From an admissions officer’s perspective, do you think doing Writing Center would be more or less impressive than AP psych (suppose I were to get a 5 on the AP exam)? What about compared to AP chem? Is it possible that choosing Writing Center over an AP class (and therefore effectively losing a 1.0 GPA bump for that class) could be the only thing that gets me rejected from an Ivy? Finally, what would you do and why?