The qc20s are earbuds, it's been my experience that they die more often. Partly from being in bags and pockets, and part from the wire-bud connection breaking down. Part of the reason I only buy mmcx models, so you can replace the wire when it wears out
I bought a pair of Etymotic Research ER4p IEMs in 2011, and was not even remotely gentle with them. They worked fantastically until 2017, at which point one of the cables came loose, and while I could have replaced the cable for $50 (Alas, not a user-servicable part), I decided that I wanted a second pair as a backup, and the replacement has user-servicable cables. My father, who is somewhat kinder to his electronics than I am, has been using the same pair of ER4p's since 2008 or so.
I went through 5 pairs in 18 months but it was because I slept with them in, and realized that was the source. Have had one pair die in 3 years when I don't sleep with them in, and I'm pretty careless (they fall on cement sometimes, get banged against the car door, etc).
