@scoalgb: Previous years UCSB stated on their website that for their Freshman application review that 50% is academics (GPA, HS course rigor and test scores) and 50% Non-academic such as EC’s, community service, personal insight essays etc… Since test scores are not an option this year, they may emphasize GPA and HS course rigor more but they still consider other parts of the application important also.
I believe (my opinion only) that UCB is probably the most holistic since they will consider LOR’s from a small percentage of applicants along with the general UC criteria outlined here: How applications are reviewed | UC Admissions
However I also think many of the campuses will look for fit, especially true for UC Davis. For every UC, what is Very important in their application review is Academic GPA, HS Rigor and the application essays.