All UC’s use a Comprehensive application review with 13 areas of criteria. UCB is the only UC campus which will ask for LOR’s from a small percentage of applicants which could make them the more holistic of the bunch.
This information is taken from the 2021 UC Counselor Conference:
There are 3 main methodologies that the UC’s use to evaluate applications: Fixed weight, holistic, and hybrid. All of these methods have evolved over time with the growth of the UC’s. In a fixed weight system quantitative values are placed on various criteria. For a holistic review, a qualitative approach is taken where there is no fixed value placed on any one criteria. Finally the hybrid system marries the fixed weight and holistic approaches with both quantitative and qualitative components.