You don't like Austin's politics and you want to move to CA? That's a new one. There's no doubt that there is some great riding in SoCal but if you're moving to a place for the riding, why are you not looking at places like the Western Slope of CO, Northern AZ, Central Oregon or even Bentonville (though it does have the heat). LA/SoCal traffic can make the I-35 look like a cakewalk. I wouldn't live in LA County for free.
If you must move to SoCal, I'd move somewhere with easy access to Mount Wilson which is probably the best MOUNTAIN biking in SoCal, some decent bike shops and the area has plenty of trendy, overpriced cafes where roadies & gravel riders like to congregate and drink $6 espressos.
If you must move to SoCal, I'd move somewhere with easy access to Mount Wilson which is probably the best MOUNTAIN biking in SoCal, some decent bike shops and the area has plenty of trendy, overpriced cafes where roadies & gravel riders like to congregate and drink $6 espressos.