The Westin easily beats them all for location
Shopping in any direction you wish to go, no need to talk with dodgy taxi drivers who refuse to drive you from Pavillion (the shopping centre across the road from the Westin) to the Imperial because its too close and they want a fixed rate vs using the meter .... and then if the driver takes you, expect to be stuck in traffic! The Imperial is no doubt a very good hotel but that 2-3kms from Bukit Bintang is enough for me to stick to the Westin. I have stayed at all the SPG properties multiple times over the years due to mattress running. All properties offer excellent Platinum recognition, and the Imperial has the best breakfast spread out of the three however they are all very good.