Bose...........
I'm still saving to replace my last one......but may stay with the Peltor ....until someone likes that one more than I do...[Don't leave them hanging on hooks]
To answer your query, I guess if your heading down the helicopter path, then gear yourself up for the higher noise levels of the helicopter, and use a Splitter Lead for your aeroplance.....
As I said before....personal choice.
Look at the potential conflict with different impedence mics between the two aircraft types as well.