I will say the weather in the LA area is better and probably more enjoyable golf days. Being a former resident of the So Cal area I would say without hesitation that Bay Area is better for golf.
Reasons Why
-IMO I prefer the cool look of Cypress Trees over Eucalyptus Trees
-If you are an Alistair Fan you would definitely pick the Bay Area (Meadow and Cal Club)
-Though the bunkers at LA and Riv are awesome the ones in the Bay Area are legendary (SFGC and Cal Club now that they restored Mackenzie’s bunkers)
-Broader range of architects to play from Bay Area (Tilly, MacKenzie, DMK, Willie Locke, Sam Whiting, Willie Watson, and Donald Ross) as opposed to the LA area which is (George Thomas, Max Behr, Jack Nicklaus, and Norman MacBeth)
-Also you just get a certain feeling when you are playing up there, a lot of history especially after reading the match book.