Since you are looking to study poli-sci Oxy really is a better option. Let me state that I went to Oxy and my own experience is that Oxy not only provided so many opportunities, but also prepared me for grad school, and working in the social sciences. Academically, Oxy is challenging but your problem solving and writing skills will be top notch when you graduate. I attended an Ivy League for grad school which I found to be easier academically than Oxy. I also don’t like LA, but I loved Oxy. Because it is so small it has the added benefit of being able to provide opportunities for students to explore LA and the surrounding areas. You definitely won’t be lacking for campus activities or experiences in LA. As for size, that really depends on what you want. Oxy was about half the size of my high school but it never feels too small; no you won’t now everyone on campus when you graduate. It is a significant financial investment. I was on full scholarship/loan but I would do it all over again. Oxy was an even better investment than my grad school at Columbia. It really depends on what you are looking for in a college experience. But if you are set on studying politcal science and becoming an effective writer in your field, Oxy is definitely worth the investment.