FYI, I THINK the QC 25 is being discontinued. I've noticed that Bose no longer lists it as product, it's harder to find online, and Amazon appears to be clearing it out as they are on sale right now. I just picked up two pairs for my wife and kid so you can still get them for now. The reason I went with QC 25 is twofold.
One, it takes a replaceable alkaline batter but the QC 35 has an internal rechargable battery, and I intend to have them for plane rides mostly for at least a good 10 years. The battery replacement program on QC 35 is rediculous and IDK how long that battery will last.
Second, the price was half that of QC35.
I use the iPhone heaphone adapter on the iPhone X and it's totlaly not a problem. I just put an adpater on the cable and keep it with the headphones. I bought and extra one for the headphones.
I'm not saying don't get QC 35, but that's why I got QC 25.
I don't think the QC 25 sound phenomenal. They sound "good" at best but I got them for noise canceling on overseas flights.
I've read reveiws that say Beats noise cancelling is just as good. So consider those.
My brother has the Bose noise canceling earbuds (mostly for flights) and likes those.