Cool, thanks for thatTechnically HDMI audio supports more audio standards but with the Node I doubt there'd be much difference, since the Node won't support DTS etc.
Asking a cabling here question is always risky. Basically it is a digital cable. Either they work or the don't. I'd go for something fairly inexpensive, e.g. Amazon Basics or similar. If audio does not cut out on you, then you are fine. I have several optical cables on equipment, including TV to soundbase and also on CCA's and never have a problem with a bog standard cable.
Try both and see if you have a preference and if one is more convenient to you.