If your hotel has a free shuttle, take the hotel shuttle.
Do NOT take the ART (Anaheim Resort Transit) busses under any circumstance that week, they will only frustrate you. Most of the time they say that they will stop running 30 minutes after
Disneyland closes, but the last bus will really leave at 20 minutes after and if the last bus is full, they will NOT send another one for you.
If you can't drive and your hotel does not provide a free shuttle, I would recommend the OCTA busses.
If your hotel is within walking distance of the Toy Story parking lot, you can also walk into that lot and take the shuttle from there. Yes, these shuttles are run by ART, but because it is a Disney owned lot, they do not let them do the items mentioned above. In addition, these buses drop off the closest to the gates out of any of the shuttles (including the Mickey & Friends Tram).
Taxis are not very beneficial, as they can now only drop off and pickup at Downtown Disney. So unless you are planning on taking the monorail in, it can be quite a walk into the parks.