I find different headsets work better in different helicopters, plus you need a multitude of adaptors.
Depends if your in a turbine or a piston too, generally piston the passive one's seem better especially if they were a good ear defender first,
Turbine the noise cancelling seem to work better, as there is more high speed whine, but sometimes they block out the low rrpm horn etc
Don't forget the mike's too some pick up alot more ambient noise than others!
Personally it all comes down to personal taste, but a good headset definitely makes all the difference.
