Prior to Roon AIR, I spent a good bit of time streaming via a microRendu to USB (no reclocker). It sounded very good and a far better solution than the nagging problems with Devialet AIR at the time. But, once Roon started supporting AIR directly, I switched to Roon AIR and never looked back. To my ears, Roon AIR sounds a bit more open and extended than USB via the microRendu and I really like the simplicity of the signal path. There were times where the microRendu needed to be rebooted (and it did get pretty hot using the 9v iFi power supply). Roon AIR just always works.
But hey, let your ears be your guide. I would love to hear what you think!