For Economics which is best between UCSD, UCSB, Cal Poly SLO?
you haven’t mentioned what career(s) you are thinking of, or future education plans.
Which kind of begs the point, because how would one decide “best” Econ dept? By number of papers published by the faculty? The number of times those papers are cited by others? Class size? SAT scores of your fellow students? Likelihood of getting the classes you wanted? Undergrad workload? What undergrad courses are offered? Percentage of undergrads going on to a PhD? For an MBA? Going to work in consulting or on Wall Street? Or any one of dozens of other parameters?
Tell us what criteria should be used for “best” in your estimation.
Post graduation goal?