HD 660S2

I actually own both. Short answer: the HD 490 Pro is way more versatile. Comfort is the first big difference. The 490 has larger and deeper cups, lighter clamp, and just more space in general. For long sessions, especially with bigger ears, it’s noticeably easier to live with. Sound-wise, the 660S2

It really depends on the setup i use. On my bluetooth headphones : absolutely not. But if i use my sennheiser HD660s2 or Fiio FF5 connected to an amp, Flac Sounds better. It's more dynamic, and sounds more immersive and more detailled. But the difference is subtle honestly, i don't think i could rec