I would compare each school’s curriculum for Business Admin-Finance major and see if there are any significant differences in either schools program. If not, then your decision should be made based on what is academically, financially and socially the best fit.
Since applications have just opened, that decision will not need to be made until Spring so apply to several CSU’s and UC’s that fit your stats.
Also realize that only 3 UC’s have Business Administration majors and Undergrad Business schools: Riverside, Irvine and Berkeley and only UCI offers a direct admit into Business Admin.
UCR admits as a Pre-Business Major and then you have to take course requirements before applying to the program.
http://undergradbusiness.ucr.edu/majorchange/prebusiness.html
For UCB, the business major is in a separate division and admits students in a competitive holistic process. Frosh intending business majors begin in another division (usually L&S), take the business major prerequisites, and apply (usually in their second years). They also need to take prerequisites for a backup major in case they are not admitted to the business major.
Make sure you have 1-2 safety schools on your list.
Best of luck.