Santa Ana is by far the best, I'd go there even if it cost a bit more. It's nicer and easier to deal with, also much closer. My second choice would be Long Beach, I don't really care for the airport but it's on the small side and closer than LAX. LAX is just horrible and I wouldn't go there unless I had no other choice. It's very busy and theres always some kind of problem when I fly from or to there.