Berkeley has a better pure CS program. It is more highly regarded and it is in a better location.
It’s also more competitive, though. My CS classes here aren’t (they’re very cooperative), and I like Northwestern’s curriculum requirements better (though I haven’t researched Cal’s).
But the Murphy Scholar program seems to be very prestigious and a good deal, especially for grad school, as PurpleTitan said. I would almost even choose Northwestern on the basis of that alone. You would get to do almost whatever you want in terms of curriculum.
Consider financial aid, for sure, as well.