Bose X are the best, no question.
Just don't lend them out to others because they aren't made to sit on or drive a car over
All other headsets are cheaper and not as good, comfort and performance wise, so it then becomes a personal tradeoff of acceptable performance versus one's budget, which is your decision alone.
The top D-C models have good PASSIVE attenuation but they do it with high earcup pressure which will give you a headache after a couple of hours. They also mess up womens' hair and that will seriously affect your flying
The only headset I would definitely avoid is the widely marketed Pilot range, especially the 17-79 model which I had for a year and found to be cr@p. I was able to prove that the ANR barely worked; the manufacturer agreed in writing, and they gave me a full refund (from the USA!).
Most headsets on the market have bogus attenuation performance quoted in adverts. Best thing is to go to a headset shop which has a ghetto blaster with aircraft noise (a gansta rap recording off Radio 1 would do) and try different models.