People gravitate to various fields because of who they are and what they want. And they choose their desired residency programs (i.e. institutions) for a variety of reasons: educational opportunities, patient demographics, proximity to family, regional preference, culture of the residents/faculty, and overall gut-feeling about a program. I have multiple classmates who are AOA that want to go into Family Medicine - and that is awesome. In the end, my classmates are pursuing a spectrum of specialities because each of us is unique. Many changed their minds about the fields they would pursue over the course of our time here - something that is very common since you don't know what you don't know.
I wanted to give you this info before the chaos of medical school applicants critiquing various match lists to determine the "best school". Because in the end, the match results much more speak to the diversity of the individuals in the class than to the "quality" of a medical school.