For MK, driving means parking at TTC and taking monorail or ferry to get to the entrance, whereas bus drops you off at the entrance. So bus to MK is better.
For AK, bus vs car may be a toss up.
For Epcot and DHS, I’d take the Skyliner, especially if you want to ride Remy first because Skyliner drops you off at IG whereas you would park at the front entrance.
If you use Disney transportation, be at the bus stop or Skyliner station 90 minutes before early opening time, to be near front of the crowds.
If you drive, parking lots open 1 hour before early opening.