LA in, say, March or April?

As someone once said :
The trouble with LA is there is no "there" there!
If you want the west coast it should be noted that San Francisco has a moderate climate all year round. From a few visits there I must say it is an easy city to get around in... with many points of interest. Also there is excellent public transport, including vans from airport. Whereas LA requires a car.
But like any major city the hotels, motels etc are pricey! Sigh. Is there anyone among us who lives there?
Is there any problem with early Sept? Or does it conflict with too many school openings? An extra three months gives a few more months to save up.