score:4
Looks like there's a shuttle bus that operates 24 hours for SGD 9.00. Your hotel is listed. Limited to one item of luggage. Can be booked in advance.
https://cityshuttle.com.sg/cityshuttlepublic/BookingDetails.aspx?Type=2
Obviously if you have more than one piece of luggage, are more than a solo traveler or are going to be especially tired and/or busy the next day, a taxi could make more sense. It's only about 20km, so it should be more like 20-30 minutes.
Upvote:5
The MRT stops at around 11:30 from Airport and busses shortly after 12 AM. You have no options, but to take a cab.
Uber and Lyft are not available in Singapore. You can install Grab or GoJEK for ride-hailing. For normal metered cab, you have to stand in queue and usually at those time, in my experience, its a long wait.
Also, Grab/GoJEK will be generally cheaper than a normal cab. Install it beforehand, connect to Airport WiFi (You will have to provide a passport number from the Kiosk) and book the cab. Ask for grab pickup directions, which is I think one level down. There will be door number, which you can provide in the app for accurate pickup.
Update: WiFi doesn't need a passport number now. You can simply connect.