The Hilton is the newest and I think has the best reviews. It is slightly out of the way for the shops but its easier for jumping on to the monorail and Light Rapid Transport system.

The Westin, like the Hilton also has a modern feel. Club level services are minimal. It is better located for shopping centres and is less than a 5 min walk from the monorail system.

I really do not like the location of the Imperial but that is me. There is a monorail station just in front of the hotel but there is not a lot very close by within walking distance.

Between Westin and the Marriott, I would choose the Westin if only because it is a more modern feel and I prefer Westin beds.