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<p>Better for what? UCSD is pretty much always ranked higher than UCSB and a lot higher than SDSU on most ranking systems, including USNews. But your mileage may vary depending on what you are looking for in a school and what your intended major is. </p>
<p>UCSD has a medical school, which the other two lack. And it sits right in the middle of a major hotbed for biotech, so it tends to be stronger in those kinds of biomedical and bioengineering programs. SDSU offers an undergraduate Business major, which the other two lack. It also is only one of the three to have a football team. What are you looking for?</p>