I find the Bose to be the best of the bunch that I have tried.
The Telex 50 has more passive reduction and is better in really noisy aircraft like an Aztec.But they tend to make you look like Mickey Mouse, that's how big they are.
I would never be able to justify to myself to shelf out $1000 for a headset.
Traded my Telex in that still had factory warranty and paid another $500 on top.
Now that I could live with....