CC transfers get priority for the UC’s and CSU’s so it will be more affordable and a slightly easier process to transfer from a CA CC than from the 4 year university.
As mentioned above, if you attend a CA CC, you could be eligible for TAG (Transfer Admission Guarantee) that will give you a guaranteed admission to 6 of the 9 UC’s that participate if you meet the GPA and course requirements. Since the UC’s accept Junior level transfers, HS grades/courses (unless they are dual enrollment or AP credit courses) are not considered.
Here is more information about TAG: https://admission.universityofcalifornia.edu/admission-requirements/transfer-requirements/transfer-admission-guarantee-tag.html