Hmmm... good question. San Diego was, when I lived there, paradise. LA is, well, LA. I guess the difference was the size. San Diego was where you live and LA was where you went for Hollywood type entertainment.
Honestly, the weather, mountains and the beaches were heaven in San Diego. The smog was so bad in LA I didn't even know there was a mountain on the east side. Lol. Didn't see it until I was headed to Vegas one day.