Start here:
If you apply to CA med schools, the adcomms there may value a UC over a CSU, but everywhere else in the country, no one will care what CA public you attend.
Since CA is major exporter of med school applicants (seriously, UCLA’s pre meds alone could fill every single med school seat in CA with plenty leftover), plan on applying widely and outside the state.
As for college–pick the school that offers you the best combination of fit, affordability and opportunity.
tl;dr–pick the school you feel most comfortable about. Happier student = better grades.