AVIOT - TE-ZX1

If sound quality is the main thing you're looking for, the AVIOT TE-ZX1 Cowboy Bebop are the best I've ever heard by some distance, and I'm coming from owning Sennheiser MTW 3&4, Sony xm4 & 5, and Technics EAH-AZ80. Only comparisons I haven't tried are the AZ100 and any of the Bose buds. For day to day use the Aviot's have issues however, the app sucks, you can't turn ANC on or off without the app, and the control buttons on the buds themselves are a bit finicky, but for out and out audio quality they're a significant step up on the above. Subjective opinion of course, everyone is different when it comes to what they like. Edit: I would also say that if you're only listening to MP3 format music, it's not going to be worth spending a fortune, you're losing so much sound quality with that format that you could get a much cheaper pair and not notice the difference.

Geekfly Legend 6, Aviot TE-ZX1, Noble FoKus Rex5. Atmos is evil.

Currently have the new pro X, they're the 3 best earbuds I've tried. They sound very clear, with a very wide sound stage, are VERY LOUD lol. The ANC is actually usable now and transparency is really amazing. Imo the only two earbuds that are better, are the fokus rex5 and aviot te-zx1, again they have 5 drivers.

SoundPeat H3 values for money. Triple drivers with 12mm and 2$ balanced armature drivers) that contributes to powerful bass, clear mids, and detailed treble, along with impressive soundstage and imaging. Other features include adaptive active noise cancellation, up to 37 hours of total battery life, IPX5 water resistance, and low-latency game mode. Proud owner of H3, Pi8, xm5, melomania A100, aviot TxZ1, devialet G2, QC ultra

3 sets is not even a starter collection yet lol Ive got about 12 pairs of tws and another 10 sets of iems. I daily an iPhone, Ive got 2 androids, a razr 60 ultra, Xperia 10vii and I use 2 android based daps. I write reviews of tws for private companies and can keep sets at very steep discounts. Different buds for different uses. Gemini 2, Rex5, ZX1, and Freebuds Pro 4 are my basshead sets for edm and trance. Ive got several sets of open and clip style buds for long term comfort wear. Current favorites are the Free Clip and Cleer Arc 3. Then randoms for specific tasks. My AirPod Pro 2 is great for dictation and phone calls. I use moondrop space travel, liberty 4 pro, raycon fitness, and aviot q3 for casual music with lots of podcasts, news, and NBA games. My nicer iem sets include ThieAudio Hype 4, Dunu Davinci, FF Deuces, and Madoo 512s mainly all using an ibasso dx180.

Purely for sound you're looking at the Pi8, Rex5, Vitas and TE-ZX1, but which of those you like best will depend on your preferred sound signature. All of these buds are focused purely on sound, which means multi driver arrangements with specific placement and airflow have been prioritized over things like mics, noise cancellation and other features that can compromise sound delivery. For solid all-rounders that do everything fairly well without being outstanding in any area, it's the usual household names - Sony, Huawei, Technics, etc

Well OP did want the best sound quality. The better TWS are surprisingly good, I paid 220€ for my Aviot TE-ZX1 and they're definitely better than most over-ear ANC headphones at least in that price range. You can't really get anything better for 500 bucks, maybe the new Sennheisers, but I haven't heard those.

I love my Aviot TE-ZX1.