Hate to reuse a tired old meme, but in my case I found I was “wearing them wrong” in the case of AirPods Max. They were very uncomfortable at launch, until I put the band way further back on my head than I do on other headphones, and suddenly the weight distribution was perfect and ever since I barely feel like I’m wearing them.
The XM4’s are equally comfy for me, but the passthrough ambient mode is far better on APM imo, like you’re not wearing headphones. The XM4’s, the pass through isn’t as good thus I remember I’m wearing them.
Love the XM4’s for travel/work, they’re faaaaar more practical in terms of size and power management.
I use the APM in the house where I massively prefer them to the XM4’s. Both function wise (I’ve completely come around to always on in the specific case of APM for home use), seamless switching between devices, an area the XM4’s are….okay most of the time, but not all of the time.
Sound quality, it’s no contest for my ears, APM by a mile - wider soundstage, less compressed. No matter how much I mess with the EQ on XM4, they always sound more compressed and narrower.
ANC, not much in it. I think the APM just pip the XM4’s.
If I could only have one it would grudgingly have to be the XM4’s due to how utterly impractical I find the APM on the go. I’d hate to be without the APM though, easily my favourite Apple purchase for years given how much I use them, even beyond my M1 Pro MBP.