academically, they are both very good. Davis is a college town and the the whole city basically wouldn’t exist but for the school. it is a really cool environment - lots of bikes (perhaps too many sometimes). IMHO UCD has grown too big and impersonal. That works well for some students but, others don’t respond as well to the big lecture halls and grad assistants for lower division classes… CPP is missing the college town feel and D1 athletics you get with Davis but, lower division courses are much smaller and the profs are a lot more accessible.
I’d really encourage you to visit both when school is in session - talk to some students, maybe sit in on a class or two. One will stand out as the better option for you.
Congrats and good luck