Newish product

Generally, galvanic isolation is used for devices such as laptops.  Their power supplies, when plugged into A/C, are not good and can cause major hum/buzz from 60hz a/c.  This is where galvanic isolators are valuable.  If you don't have this problem, it's better to avoid the isolator modules and focus on a really good USB cable. USB interface is highly dependent on timing of clock signals and you don't want anything in the middle that could cause timing problems or degradation of signals.  If you want to try to improve USB audio, your better off getting a USB reclocker, such as Wyred 4 Sound "Recovery" product.

auxinput, sometimes I use a MacBook and I don't experience and and buzz or hum which I guess is good. I don't quite understand the timing or clocking issue you mention. How would I know if that's a problem? I'll need to research and learn a bit.

Any recommendations on a good quality USB cable to purchase?

anything really (as long as it is not made out of Chinese drywall) - put your $$ into a reclocker as per above and look at or test the offerings from Uptone Audio (no affiliation)

Anker makes a good USB cable as do others

all you need is to get the stream of bits transferred and not get so much noise that bits are altered, and avoid gnd loops

digital is not analog...

BTW, linear power supplies are another place to put $$