SNA is usually more expensive, but not always, you just have to check around. Another alternative is Ontario (ONT). I don't think it's any farther to DL than LAX, and still smaller.
I haven't had any huge delays with SNA, although the last time I flew through them was this past Thanksgiving.
another thing to be careful of is late arriving flights. Flights have to arrive by a certain time (I think it's 10:30, but it could be as late at 11:00) or they get rerouted, usually to LAX. This is a huge pain. Also I think they have tons of flights scheduled for 6:35, but aren't actually allowed to have any lift off until 7am.
Donna