I always employ the former when pronouncing ‘Valencia Street,’ and as far as I can recall most other people do as well. So hopefully you can understand how taken aback I was upon hearing the auto bus stop announcement aboard Muni instead use the latter. Now I’m all out of sorts over the matter.
If you think I’m foolish for even thinking about trusting Muni’s onboard speaker system, I point towards exhibit A: its flawless rendition of Gough. Surely it can’t be right in this case though?