I personally prefer using Ety IEMs instead of noise cancelling stuff when traveling. the huge factor to consider is how long can you wear those stuck super deep inside your ears before you start hurting? if you have no experience of such IEM, I'd suggest to get yourself like a pair of the cheap options, like Etykid and try to get used to wearing them long before your flights.
some people like me are fine with ear probes for tens of hours at a time, other just don't have the ears for it or just can't relax with such an intrusive feeling, you 'll have to find out yourself which kind you are. I suggested Etykids(because they're cheap so you don't cry when you forget them on the plane), but also in case you're going to venture in plugging anything into the cabin's audio system, that stuff tends to have the captain speak at full volume no matter what volume setting you've set, so you most definitely do not want something very sensitive!!!!! or him talking will become hear damaging loud. some inline Shure volume attenuation or something or the same effect can become your best friend to avoid official ear rape messages while watching a movie(you set things so the movie is blasted at full volume and you adjust with the Shure thingy, that way that treacherous captain will only be as loud as the movie.
and of course if you have to take your IEM out every 10mn because someone decides to talk to you anyway
, chances are that your ears will become irritated after a few in and out repetitions with etymotic IEMs. while some modern headphones with ANC can have all the fancy options and mics to let you hear ambient sounds clearly at the touch of a button without having to move the headphone at all.
so it really depends on the type of travel you expect, and how you feel wearing the respective products.