Whats the popular brand, most musical, digital cable now? What format?

One more thing, Macbooks from 2016 and later don't have digital output at the headphone jack, the only digital output from them is via USB. 

I will second the Wyred 4 Sound Remedy reclocker. It improves about any digital source even my CD player sounds better through it. Computers are very electrically noisy and are not the best source for audio but the Remedy really improves their sound. Also Wyred’s bLink is a good choice. Thats the version I have. Its a Remedy with blue tooth and works the same magic on blue tooth as well as allowing connection to another digital source. I would go so far as to say that with the bLink and a phone or tablet with blue tooth aptex capability streaming Tidal etc. that many would be happy with just that. It really is that good!

As far as which connection is best you just have to try and see which sounds best. If your computer has both options.

I stream Tidal via Roon from an Antipodes server/streamer to a Denafrips Pontus DAC using a Curious Cable USB cable and find it very satisfying. Not thin at all.

I would normally try a coax or optical connection but enjoy the way it is too much to change it around. Probably should for my own education...........or confusion lol.

You’re SQ is limited by using toslink or usb to the dac. Did that for over a dozen years and bought into the Usb tweaks, still compromised. Use i2s or Ethernet into a dac/network interface and get rid of all your usb and toslink stuff. 

@rbstehno I have a MacBook Pro 2013 and a PS Audio Direct stream DAC. The DAC accepts i2s. My question is how do I physically connect from the laptop to the DAC?  I don’t have an i2s port on my laptop.