Sonos came to headphones late and built this one around a single feature the other two cannot match: a button moves the audio from a Sonos soundbar to the headphone and back, mid-episode, without touching the television. If you already own the soundbar, that is the difference between a headphone you reach for in the evening and one you do not. Sonos names the compatible bars — Arc Ultra, Arc, Beam and Ray — so this is a specification you can check rather than a promise.
If you do not own one, the case gets much harder. At 312 grams it is 58 grams heavier than both rivals, which weigh 254 grams each. Weight is the specification that decides how a headphone feels after two hours, and 58 grams is not a rounding error on something that sits on your head for a working day.
The codec support is the widest here on paper: SBC, AAC, aptX Adaptive and aptX Lossless. The qualifier matters. Sonos states that lossless over Bluetooth requires an Android device with Qualcomm Snapdragon Sound. On an iPhone, or on an Android phone without that chipset, the feature is simply not available to you, and the specification quietly becomes AAC like everything else.
Battery matches the Sony at thirty hours with cancellation on, dropping to twenty-four for calls, and the three-minute quick charge returns three hours. Bluetooth 5.4 is the newest radio of the three. None of that closes a 58-gram gap on its own, but it does mean the Ace is not a compromised product outside its one trick — it is a good headphone with an unusually specific reason to exist.
Where it is unambiguously strong is build. The earcup and headband construction is the cleanest of the three, and the pads are magnetic, which makes replacement trivial. Earcup pads are the part that fails first on every headphone in this class, usually around year three, and a headphone whose pads you can swap in ten seconds has a longer usable life than one whose pads are glued.
It also folds flat, which Sonos states in its own announcement — as do both rivals, so treat that as table stakes rather than a differentiator. The honest reading of this specification sheet is narrow: a very good headphone with one exceptional feature and one clear weakness, and what is under your television decides which of the two matters more.