hmmm... as title says really.
I've got no experience with noise cancelling headphones, but even deeply inserted IEM's such as Etymotic ER-4P's I found lost a significant amount of bass (not that they had much to begin with) to low frequency engine rumble in planes, trains and buses.
Do full sized noise cancelling headphones fare better in these scenario's?
I thought I once might have read that IEM's are better for attenuating high frequencies, and noise cancelling headphones were better for low - but I can't remember where or if I got it switched around.
Anyway - it's kind of moot for me cuz my doctor said that owing to my extreme earwax production that leaves me blocked up and deaf for weeks on end I'm 'banned' from using IEM's (gross but true) - but would be interesting to find out anyway.