Launch prices as reported by What Hi-Fi?. Street prices change often; check the listing.
How to tell the generations apart on a listing
Bose reused the QuietComfort Ultra name for a first and a second generation, in both over-ear and earbud form, and the photos look almost identical. Look for “(2nd Gen)” in the title and again in the product details, not just in the images. On the earbuds, a case that charges wirelessly is a useful second clue for the 2nd Gen.
The plain QuietComfort Headphones (2nd Gen), without “Ultra”, is a different, cheaper model, not an older version of the Ultra.
Immersive Audio: worth the battery?
Immersive Audio is Bose's spatial mode, which makes stereo music sound as if it comes from speakers in front of you. Some people love it for films and long listening; others turn it off in the first week. It costs battery either way: on the Ultra Earbuds, Bose's rating drops from six hours to about four with it on.
Bose or Sony?
Bose for comfort, a slightly stronger block in What Hi-Fi?'s judgement, and aptX on Android. Sony for the faster quick charge, excellent call microphones, a more detailed app and better sound by the same reviewers' account. Read the Sony review and the Bose review side by side if you are torn.
Questions about this
What is the difference between Bose QuietComfort Ultra and QuietComfort?
Ultra is the flagship with Immersive Audio and a more premium build; the plain QuietComfort is the cheaper model. Both come in 2nd Gen versions.
Is the first-generation QuietComfort Ultra still worth it?
Only at a clear discount. Check the listing carefully, because the titles are nearly identical.
Do Bose headphones work with iPhone and Android?
Yes, equally well on both, which is one of their advantages over AirPods.