We did this in October! DH and I used the Super Shuttle and to be honest, it took longer for the van to load up than to do the drive.

After all but one passenger boarded, the driver circled the entire airport for the last scheduled passenger for 45 minutes. No one on the ground knew what was going on, so our driver pretty much cruised the pick up areas until he was found. Because of their lack of organization, I'd be leery of Super Shuttle out of LAX.
Now, we're flying into SNA this week and we're using Super Shuttle again. We figure the delays can't be that bad because it's a SMALL airport. haha! TBH - we did Super Shuttle from SNA to the HOJO before and it was perfect, so we're hoping for consistency on this trip, too.