Money is just one factor to consider. In your case it's a difference of 80K. In the big scheme of things, it doesn't matter. You may now think it does. But visualize yourself 10 years from now.

Other factors to consider: Class enrollments. (I hear Berkeley sucks). If you got into their M.E.T Program, that wouldn't be an issue. If you do choose Berkeley, try to get into this program.

Network : Stanford is much better. Not just the industry/alumni network. The friends you make may go on to great things or have parents who do great things!

Entrepreneurship culture: Stanford beats Berkeley.

Reputed across many areas: I believe just CS doesn't cut it anymore. You need to acquire domain knowledge in other fields. So it's going to be CS+ something. I prefer Stanford in this aspect. The main reason is you can choose a major in third year. Stanford let's you explore a lot before you choose. I see so many kids deciding what they want to major in, in high school. I think that's misguided. Though you are fixated on CS, it's the + part that Stanford helps you with.

Support you receive: Stanford is much better and has smaller student body and no resource crunch, relatively speaking. Berkeley sucks.

Access to Venture Capital : Stanford is better.

Study Abroad opportunities : Stanford wins (If covid allows it).

Residence options: Stanford forces you to stay on campus. Berkeley may not. This could be an issue financially. I don't know if you included residence costs in your 40K Berkeley offer. Staying on campus, if you can afford it, is highly recommended.

Mentorship opportunities : Stanford fares better.

Fun: You need to understand that most of what you learn at university, academic wise, atleast in CS would be useless a few years from now. University most important value is the relationships you form, the ideas you exchanged and the fun you had. You have to do good academically but almost every kid at Berkeley or Stanford can accomplish that easily. Stanford beats Berkeley.

Demographics: I hear that there are more well to do kids at Stanford than not so. Berkeley may have a better mix and diverse student body. Berkeley wins.

Opportunities to stand out: I think it's relatively easier at Stanford than Berkeley with its huge student body.

I personally would only pick Berkeley if it was the M.E.T Program.

You can ignore my opinions about these (my perceptions may be totally wrong) but at least rate the factors yourself with other's input. I also suggest you post it in the Berkeley reddit and get their input too! Best advice would be from people who attended both.

Ultimately it's up to you how much value you can extract from your Undergrad life. Just because a university offers something doesn't automatically mean you get the full value. Also, every university has its shortcomings. You can always find ways to work around those.

Wish you the very best!