I'm a native New Yorker but lived in the SF Bay Area for 9 years. I agree with this assessment. The quality for the price in generally better in the Bay Area, since a lot of the food is local and super fresh. That said, the diversity of cuisines in NYC in much, much broader than SF. For example, in SF you can find Salvadorian and Mexican food quite easily, but New York has food from all parts of Latin America. The same can be said about other regional cuisines; the selection provides a "finer granularity" of choices for that region.