I think there was a test done before:
https://www.audiosciencereview.com/...s/do-usb-audio-cables-make-a-difference.1887/
Basically cable quality doesn't really matter, cable length matters more. But in normal usage it should not make any difference unless you're running like 100 meter length between your dac and computer LOL.
The claim is that the USB implementation is noisier than their Coaxial implementation on the Mimby device itself. So people opt for the Coaxial connection. Which I don't know how big the difference really is. But if you need to get another device to get Coaxial which introduce another device in the chain that might introduce more noise anyway then I say just use USB and call it a day LOL.
Realistically I'd say don't worry about it LOL.