[StinkyBuns]

Hmmm it depends on what you like to do...
I consider San Diego more 'outdoorsy' where people are more active bike riding, hiking, etc. The zoo and Sea World are also great.

In LA, there are great hikes too (Griffith Observatory, hikes on the coast off Pacific Coast Hwy) and the beaches are beautiful (Malibu). There's also the more 'hollywood' area & touristy stuff, like the walk of fame, rodeo drive, Disneyland, Knotts Berry Farm, etc. We also have nice shopping areas like 3rd Street in Santa Monica, The Grove in Los Angeles (midcity).

I live in LA, so if you choose LA, I can give you more specific recommendations.