Received wisdom is that Transparent Reference XL is among the best, but at $3595 for 1m is pricey. I use three of these in my current digital setup and they handily beat the Audioquest Wild I was using previously. I’m just about to audition the top of the line Marigo labs cable to see if they perform as well as the Ref XL at 2/3 the price - as my setup still needs one more pair
The best advice I can give is to stick to the used market. Digital cables are available at 30-40% of list and there’s no need to pay more (the exception unfortunately are the Ref XLs which almost never show up used and even then hold their price well). Start with something like this https://www.audiogon.com/listings/digital-transparent-premium-aes-digital-2-meter-2017-08-18-cables (offer 35% of list) and see if you like the house sound and then you can trade up from there if you want