[bighal]

I would just get the bus and if you are staying at a resort with multiple stops get on at the first one to make sure the bus won't be full by the time it gets to your normal stop.
Getting into the park early does not guarantee you a boarding group so I personally wouldn't spend the extra cash on a lyft/Uber where you could still be held up at the parking booths. And the $35+ for a Minnie van is a definite no...

Anecdotal evidence suggests bigger groups get the later boarding groups so if you are a large group you may have better odds of riding if you split into smaller groups although you may not ride at the same time.