“Community: I feel like Harvard’s atmosphere and social scene would be a much better fit for me in almost all aspects. I would most likely be happier going to Harvard than Stanford.”
There’s your answer. Any reputational differences between Stanford and Harvard are so small as to be negligible. I’m on the West Coast in tech at a big household name tech company and yeah, Stanford has a better reputation in tech on the West Coast - but Harvard is still HARVARD. We recruit there, too. (And frankly, I know more Michigan and Washington grads at my very large company than Stanford and Harvard grads. I know more Waterloo grads here than Harvard and Stanford grads!)
Also consider that you might change your mind about your major and what you want to do. I started off as a political science major in college and changed to sociology and then psychology. My husband wanted to major in aerospace engineering and be an astronaut since he was 3 years old; he decided that wasn’t for him three years into college, and ended up graduating with a statistics degree. Of my working professional friends very few of them are doing exactly what they expected to be doing even 5 years ago, let alone when they were high school seniors. Go where you’re going to be happy.