http://talk.qa.collegeconfidential.com/university-california-berkeley/2071932-grade-distributions-in-prerequisite-courses-for-gpa-based-goals.html can help you with grade distributions in UCB CS courses which you need to earn a 3.3 GPA in to get into the L&S CS major (percentages may differ slightly this year from when that post was made).
Although UCB classes can be very large in CS, Cornell classes in CS may not necessarily be small. Unfortunately, Cornell’s publicly accessible class schedule does not show class sizes.
https://classes.cornell.edu/browse/roster/SP19/subject/CS
https://classes.berkeley.edu/search/class/compsci?retain-filters=1&f%5B0%5D=im_field_term_name%3A831
You can check the career surveys from each school. There will likely be some regional bias.
https://career.berkeley.edu/sites/default/files/pdf/Survey/2018ComputerScience.pdf
https://www.engineering.cornell.edu/industry-partners/enrollment-statistics-and-post-graduate-data/post-graduate-survey-and-reports
How does the cost difference matter to you and your family? How much would loans/debt be affected?