so I did my Singapore vacation with a company called Veena World. It was a little expensive than that of what I would spend solo, but they do all your arrangements really well. you have to worry bout nothing. the only problem with such agencies are, that they have a fixed itinerary and you can't do a lot of things that you want. so it depends.
If you are travelling for maybe a chilled relaxed vacation, go for some agency(I personally suggest Veena world but it's your choice in the end). And if you want to explore the place and be a adventurer with your own itinerary, go solo! Have a great vacation and get back to share you experience <3
Hi Bharat, Singapore is a destination that you can travel on your own if you know all the places to visit and how to go about things. I'm going to attach with this comment some posts about Singapore that will help you plan your trip. Also if you do not want any hassle of booking the accommodation, managing local travels you can go ahead and book with an operator.