The problem with the taxi (or Uber, or private car service) is that depending on the age of your children, you'll need to provide car seats.
We did the DL Bus back in 2012 from SNA to the Fairfield Marriott (right down the street from Park Vue, next to HoJo's) it took FOREVER and our 14 month old was SO ancy! From the time we got on the bus at the airport (it had just arrived) I think it was over 2 hours before we were dropped off at our hotel. It was awful. That said, In May I'm potentially taking my now-5-year-old a girl's trip in May and we will be taking the DL bus again since I won't have a car seat and I refuse to trust the provided car seats from car services (we had a big issue with Lansky's back in 2014 where they provided illegal-for-the stated age & Expired car seats for my kids and at the time said they would do the install and didn't know how to properly install them, it was a mess).