UCLA, UCB and UCSD have holistic admissions (more like private schools, although they can’t take race into account). The other UCs are comprehensive and put more emphasis on objective measures (GPA, test scores). One thing UCLA takes into consideration is “Likely contributions to the intellectual and cultural vitality of the campus.” Whereas, if you look at the UCD website, they just say they use the 14 criteria all UCs use.
This is what I was told by my supervisor who is reader for a UC.