Very true. How noise is perceived or how intrusive it is, has an element of subjectivity.
These figures are the certification noise data, warts and all: they are measured under set conditions, per prescribed procedures and verified by the certification authority; however, like performance data, real life can be different. For a real comparison, you would need to fly all three helicopters, on the same day, using the same profile.
Better data on noise signatures does exist, but not in the public domain.