Yes, there are. UCs are more successful than CSUs in sending students to med school. This could be due to a number of factors, including less support for pre med students at CSUs, less research funding, students at CSUs tend to be more focused on job -preparation type majors than purely academic majors.
The UCs are all R-1 institutions; none of the CSUs are. This mean finding research opportunities will be easier at the UC campuses. The UCs have a widely known reputation for academic excellence; the CSUs are less well known outside of California.
For example, a recent survey of UCB premeds showed that 50% of those with a 3.6 GPA and 510 MCAT were accepted to med school in that last 3 years. This is higher than the national average of of 40%.
UCLA had about 53% of its premeds admitted to med school in 2022 (last year data is available)
UCSD has a ~40% acceptance rate in med school admissions, with 4% of its pre med undergrads being accepted into UCSD SOM.
UCD had 42.1% of premed applicants accepted in 2024 application cycle.
UC-Riverside, otoh, has a much higher proportion of pre meds than other UC campuses and only about 35% of UCR premeds are successful in gaining a med school acceptance.
UCSC does not track its pre meds so there’s no data for that campus.
SDSU has had a med school acceptance rate in the 31-40% range in recent years.
CSU-Fullerton had about 33% acceptance rate into med school in 2018 (last year data is available)
CSU-East Bay’s data is unclear since this campus hosts a GPA-enhancing post-bacc program and its pre-med advising does not separate out whether a med school applicant is a post bacc or direct from undergrad applicant. The premed office claims a 40% success rate (which is right at the average nationally)
So there is a slight advantage in attending a UC campus over a CSU, though it depends on the specific campus