I will admit to knowing little about UC Davis except that it is not as famous as Berkeley. But looking at the SAT score ranges of the two schools confirms my statement that Berkeley has more top-notch students.

UC Berkeley
Test Scores -- 25th / 75th Percentile
SAT Critical Reading: 600 / 730
SAT Math: 630 / 760
SAT Writing: 610 / 740

UC Davis
SAT Critical Reading: 520 / 650
SAT Math: 570 / 680
SAT Writing: 530 / 650