Coming out of Berkeley you'd have more access to SV given that a lot of people will choose to stick around in CA. I don't think it'd make a difference either way as they are both good schools. Everything else depends on you. Study hard at either schools and BigCos will want to hire you if you participate in their recruitment process and ace the interviews.
Here is a different perspective. Figure out why you want to choose one school over another. If it is purely for vanity, go to UPenn/Berkeley and transfer to Harvard. If it is for learning, either are good enough, the rest is up to you. If you want to work in SV Berkeley buys you better access + larger network that end up working in Tech.
Anyways you should read this article [1] by Derek Sivers, I wish I had when I was going to college. If you want to get the most out of college, here is my advice: kill it in your academics; join a fraternity/sorority that you'd rank as the top three on campus; learn outside the classroom on your own; join a max of 3 clubs and get deeply involved (sky diving club, salsa dancing, etc); join a public speaking club; make lots of friends your freshman year, become the initiator of campus outings/group outings. I didn't do a lot of these myself, but if I could go back, these are some things that I wish I had done [Georgia Tech 2012].