I don't mean this harshly but if you're really that worried about vibration then maybe helicopters aren't for you? Jets are nice and smooth.
By their very nature helicopters all vibrate a bit and like people have pointed out a lot of it is due to setup as opposed to the actual model of aircraft.
In any operator running a large fleet you will find variation from smooth to a bit shuddery or wobbly - engineers have time to get things running safely and within limits but can't afford to spend hours and hours tuning every machine in the fleet to be as smooth as silk.
For what it's worth, my opinion is that the 92 is smoother than a 44 almost all the time.