UberX if it’s available – it’s usually less than $30 compared to a taxi which is usually around $40+. Personally, at that time in the morning I would prefer to take a private car/taxi and not rely on public transit (bus) or shuttle service being on time or forcing you to leave way earlier than needed!
I had a great experience with Uber recently with a fresh out of college coworker that showed me how it worked. Super easy, reliable and efficient. Best part was that when it came time to split the bill the app did it for us no fumbling with cash/cards!
Just make sure you select UberX instead of the “Black Car” service if you want the cheapest fare! You have to download the app to your smartphone to be able to use the service.