I agree with PG and MA and many others that a startup, especially a good one, has a much better shot in a startup hub.
Both the SV infrastructure and mentality value those that build great technology. While it is true that there exist other pockets of this (NYC, Boston, Austin, etc).
SV is not a pocket, it's the entirety of the community and that has massive value.
(Not to generally say which is a better city for startups, but just curious to your reasoning).