Peterson!!! - recurring accidental gag line in 'The Forbin Project".
Maybe because LA is a dystopia, while SF is a utopia?
Seriously I once spent an hour looking at random google maps pictures around LA and around SF. The vast majority of the SF one are beautiful. Bridges, mountain, beach, pretty houses, gardens, sunsets, etc. The majority of the LA ones are ugly. Parked cars, slightly dingy looking buildings, streets, highways.
I'm sure there is lots of cool stuff in LA, its a huge city afterall... but at a glance it can be pretty horrid, while at a glance SF is pretty idyllic.