Both are year round destinations so it's close, but for me, Southern California wins out.  I like it's proximity to San Diego Zoo and Wild Animal Park, Knotts Berry Farm, Disneyland and California Adventure, Universal Studios Hollywood and Six Flags Magic Mountain.  I get to Florida every year, where unfortunately I only get to California every five years or so.  It's more expensive to go to California, but SO worth it for entertainment.  Great beaches too.