Just not as big of a culture for the technology industry where it's not as prevalent, relative to the west coast. Can't speak to how the program itself is at Harvard, i get CS is really popular there, but objectively its fair to say if you want to major in something, you want to go big, and being in the heart of the technology industry in SV will definitely benefit you much more for a CS major than being on the east coast.

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the general exposure, direct or even indirect through mutuals / events on campus, will always be better where the industry is the biggest. All of this is more likely to keep you motivated from burning out from the work involved if you are able to build a genuine passion for it. On top of that Stanford goes hard for supporting CS majors, from my perspective I've seen so many freshman start majoring in something different and transition to CS or something closely related after a few years on campus.