As the saying goes...Better, Faster, Cheaper...pick two.
IMO, yes Uber/Lyft is the best balance of cost and efficiency absent special needs like car seats
You can get there a bit quicker by hopping in a cab that is on standby curbside, but cost a few bucks more
You can get there cheaper on the DL Express or SuperShuttle, but takes lot longer waiting for bus pickup and drop offs.
We always Uber from SNA