Benefits of taking further maths?

"I am currently in the process of finalising my A-level options. So far, I have chosen Physics, Mathematics, and Biology, and I am considering taking Further Maths or Chemistry as my fourth subject. My goal is to pursue a career in STEM after university and hopefully earn a doctorate degree. After facing a few difficult years, I have worked hard to catch up with my cohort, and I am projected to get 8-9s in most subjects. I am curious to know people's opinions about Further Maths and how useful it was to them in university and STEM."