@E.Jane, go on flylax website and look at the interactive map. You can type in the airline you are considering and see where it is located in comparison to the LAX-it ride share area. (It should give you directions too.)
If you are where I think you will be it is a walk, not a shuttle to get to the LAX-it area. Yeah, the area will be crowded and busy but direct flight and saving $1400, I will deal with a minor walk and crowded ride share area. That's just me.
And I love being spoiled, SNA is fantastic. But for those savings and no layover ... no doubt I would do LAX.