Are you in the process of applying? If so, no reason not to apply to both since both campuses are impacted for Biology majors. Better is in the eye of the beholder so to speak so you need to figure out which school is best for you.
What are your career goals as a Bio major? Any specific interests in the field?
Check out each school’s curriculum and electives to see which would fit your goals specifically.
What are your stats and EC’s to help posters give you a more informed answer to your question?
Why are you just considering these 2 UC’s?