Like they say, it's not number 1 for everyone
I was born and raised in the bay area so one of the reasons I chose UCSF was because of location. I want to be around my family to help support them in any way possible.
Another reason was UCSF's program itself. It was unique and impressed me more than any other school that I applied to. I believe that the education and support I will receive from the faculty will better prepare me for my future as a pharmacist!
UCSF's mission statement also aligned with my own beliefs
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Tuition is cheaper, though living in the city may not be... but hey, you're in SF
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So in conclusion, it really depends on what you're looking for in a school.