driving in Singapore is the best option as you not need be in a hurry to wait for a train or bus; your freedom is not restricted when you opt for car rental in Singapore or Singapore airport transfer.
Driving in Singapore is an ultimate Experience and so it's always crucial to search for car from hire companies early on, especially when one will indeed need to rent a vehicle during the trip.
One way car rentals are great for those who are going on a road trip but only need transportation for the outward journey. Whether you don't have a return planned, or if you are returning using another mode of transport, there are a number of car hire companies that will offer you this one way option.