Yeah, I know about the ranking, but the thing is some people keep telling me that because your major is CS, California have a lot more opportunities for jobs and internship.
Unfortunately, I have no chance of visiting the schools, but I've talked to one of the students in UChicago and she seemed pretty happy working in the lab. But not much info, and I think the students' words might be biased.
I'll search for the alumni as you've suggest, thank you very much