Thought I'd add my two cents on a recent comparision I had:
Network Acoustics Muon (1st edition - no longer manufacturered, replaced by
Muon 2)
QSA-lanedri Gamma Infinity
AAAudio Sig XT
I've had loads of USB cables over the years, my prior reference the Sablon Audio Panatela Reserva 2020 which was comfortably beaten by the Muon 1 once it had broken in - to me Muon was the first USB cable which didn't sound broken compared to other digital cable formats (e.g. Coax spdif or AES). I did own and directly compare Muon 2 against the Muon 1. Muon 1 stayed for me, I found the Muon 2 too technical and I simply love the inbuilt filtering in the Muon 1. So Muon 2 was returned.
Compared to the Muon 1, all of the above cables are peers, with differences:
QSA Gamma Infinity - is by far the best for tone, it's easy to hear the QSA treatment. If you prioritise tone, this is the one you might wish to consider. I got mine on the $1,000 offer, at that price it is a worthwhile recommendation, but the performance delta on tone does not warrant more compared to the other cables. IMO where this USB cable is let down is it's internal geometry (it's a bit simplistic and it's performance comes from the QSA treatment) - I just feel that the other cables have better geometry and it would be nice to have a QSA USB cable with more advanced geometry. For example, the Muon 1 has better soundstage dimentions and separation.
AAAudio Sig XT - very similar to the Muon 1, perhaps more technical akin to the Muon 2 as it's more transparent and detailed than Muon 1. It's slightly less forward in the mids, louder than the Muon (I had to turn my amp down 1-2dB which is always a sign of good conductors). It's stand out traits are soundstage (which is huge and well defined, bigger than Muon 1) and speed, it's a very quick sounding cable. But that's not all, I tried it with the
AAAudio USB Isolator which was powered off a 5v Ian Canada Quad Ultracapacitor pack, which really boosts performance (I have a SoTM q370 based music server and prefer USB from it's motherboard). I would say is you have something like a Pink Faun (ultraclock), JCAT or Taiko USB card or other high end server > £7k RRP (Melco, Aurender etc...) then the boost in performance may be deminished for adding the isolator, but you'll still hear some benefits. I have tried a few USB isolators before (with the same ultracap power) and many of them did nothing in my setup... this one works. Highly Highly recommended to use the isolator if you have a lower end streamer / music server.
At about £1,050 for the AAAudio Sig XT, it gets my recommendation as it wins on performance and price in comparision to the above.