Some people like training at county hospitals. It is undeniable that county hospitals are exciting places to train, that your adrenaline pumps a little harder when you have back to back to back traumas, have huge lines of indigent patients waiting to see you, and fewer support to help manage the sick and injured. It is a personality thing; From my experience it is more common in those with a more surgical bend. Regarding the SUNY program in Brooklyn, it is extremely similar to LA County, but with a different population. It may have a little less trauma, but certainly enough. I remember talking with one extremely happy PGY2 at LAC-USC who told me "I wasn't sure if I should go into EM or surgery - I definitely made the right choice. "
Now, back to the issue at hand: choosing a medical school to match in EM. EM was born in the trenches and most EM program directors have no issues in looking below the ivory towers to find the best residents. That is less so the case with other residencies. If you think you may eventually want a real competitive residency, such as derm, ortho, urology, optho, radiology, ENT, then I suggest you go to the best name. If you are primary care type person, who will likely head for medicine, pediatrics, EM, then try to save the money and head to a state school and save yourself over 100 grand in loans. But you never know - I went to med school thinking about neurosurgery or interventional neuroradiology and came out an emergency physician.
Post script: Most, but not all, people with EMS experience before med school end up going into EM. If you were involved in EMS, and this played a large role in your decision to become a physician, then it is likely, but not certain, you will end up as an emergency physician.