watching a bunch of comparison videos and reviews.
Here are my reasons, if anybody cares:
Bose apparently blocks out much more of the lower frequencies, and since I'll be using them almost 100% on an airplane, this seems right.
Bose will allow 2 headphones to share content, if my wife and I want to watch a movie together on the plane using our own headphones, we can. Sony can't.
Bose has buttons, and for this old man I understand that better than swipes and touches.
Sony has an external mic on the top of the headset that one reviewer said was picking up the airflow from the overhead vent in an airline seat and affecting the sound he heard. He said re-aiming the vent fixed the problem, but it's minor things like this that tipped me to the Bose since on an airplane is where I'll use them.
..and thanks to Tokolosh's link, the Bose were ~$20 less than the Sony and $90 less than anywhere else.
Thanks!