Back to this question, but under slightly different circumstances.
My goal now is to convert USB to SPDIF (Toslink and/or coaxial) in order to connect laptop to non-USB DAC (Meridian 565) as well as try coaxial/toslink input on PS Audio Digital Link III as the synchronous USB input is limited to 16/44.1 while coaxial/toslink both support up to 24/96.
There are several options, but broadly it seems the question is "synchronous vs asynchronous"?
Synchronous option ($42):
USB-C to Toslink dongle
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Asynchronous options ($55-100):
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U2 is a USB to Toslink optical and coaxial converter, suitable for PC computer, notebook, android phone(OTG), set-top box, rock 64, raspberry pi and so on, it can bring better listening experience than PC own sound card.
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Audio-GD Digital Interface (private sale @ $80) NOTE: apparently this converter employs some kind of proprietary DSP-based reclocking for "pseudo-asynchronous data transfer"; however, it is quite well reviewed by many users across many forums/sites:
hifipig.com
What would you go with? Audio-GD with DSP "pseudo-asynchronous" connection (well reviewed) or less reputable unit out of China that is "true asynchronous" type with two discrete crystal oscillators?