Better questions that should be your priority: do you want to spend four years in Chicago or SF? I assume Chicago will save you a pretty penny (including living expenses), but anyway cost is a major consideration unless you plan to do HPSP, etc. Do you think you want to do post-graduate training (specialty, GPR/AEGD)?
UCSF is the more "prestigious" school; however, it is P/F and that (sometimes) can affect post-graduate selection. That being said, I only externed there but the didactic education and research opportunities are second to none. Plus I love SF. I know UCSF has started night clinics, so you should have no shortage of patient experience.
I placed more emphasis on the clinical education than I should have when I was choosing schools. About to graduate, I now realize that no school in the country will graduate a competent, up-to-speed dentist. I don't feel any less prepared than someone who did 50 units of fixed in dental school to my ~20. Sure, some programs are stronger clinically. But seeing 2-3 patients a day for a couple of years pales in comparison to 1) GPR/AEGD 2) real-world practice. There's only so many ways to cut a prep; any deficiencies can be made up with a residency or good CE.
I will say if one school permits you to do more externships, mission trips, etc while in school, that's a strong facet of clinical education you'd want to consider and take advantage of.
TLDR: don't base your decision on clinical training; there are far more important factors to consider.