https://www.weather-us.com/en/california-usa/san-diego-clima...
SFBA winters are kinda miserable IMHO. It's not rust belt snow bad, but consistently cold and wet for months isn't exactly ideal.
And SF-proper regularly being fogged in renders too many nights useless WRT enjoying the outdoors, year-round. It's almost pointless to have something like a rooftop deck or outdoor patio. It'll all corrode and rot before you get sufficient use of it.
San Mateo manages to escape most of the negative fog effects though, I enjoyed living on the hill by 92 and Hillsdale Blvd. We'd regularly watch the apocalyptic fog stall @ Skyline while enjoying dinner outside on our deck.
Also the bay encompasses more than SF, while SF and daly city have notoriously foggy weather, the rest of the bay area is quite good.
Anything North or West is cold and foggy.
South Bay and East Bay pushes 100F for 3 months a year.
And this is before you consider that we now have 1-2 months of smoke season.
Even within LA the temperatures vary, the closer you are to the coastline the better the weather.
I know because I grew up in the south bay, I lived in SF for 2 years and lived in LA for 10 years.
What's overall better in socal is that the winters are much more mild. In the south bay the worst you can get is ice in the morning and really cold nights. Socal winters just has a very slightly lower temperature than spring.
Not trying to say NorCal has better weather than Socal. I'm saying NorCal has some of the best weather in the world despite it not having the "perfect" weather that Socal has. The entire CA coast line is afterall still in the mediterranean climate zone.