@preppedparent Individual anecdotes aren’t very useful. Clark Kerr holds less than 900 students. Thousands and thousands of students who want housing are shut out of Berkeley campus housing after their first year. I know several of them. Yes, a handful of undergrads manage to have close relationships with a professor, but it is atypical - not surprising when you have 28,000 undergrads and so many classes have over 100 students in them (sometimes several hundred). The student/faculty ratio at Berkeley is three times higher than it is at UChicago.
Basically, all of the things that a few students manage to get if they really hustle and get lucky at Berkeley are available to all of the students at UChicago. Look at the Metcalf internships, for example. UChicago will directly arrange summer internships next year for over 2200 students, with businesses and non-profits all over the country. That is nearly half the entire student body, which means that pretty much anyone who wants one, gets one.
I will give you this - If the OP got into the CS program at Berkeley AND was absolutely certain that he wanted to do CS, then I would understand choosing Berkeley. It is a great CS school with connections to Silicon Valley rivaled only by Stanford. However, if he isn’t absolutely certain what he wants to study or where he wants to end up, UChicago is a better bet for the same reasons that the Ivies or Stanford would be a better bet.