It really depends on how good the USB receiver/clocker module is in your new "nice DAC". If you get a DAC with a nice upgraded version of the
Amanero
USB module with good clocks and power supply, it could be better than a USB-to-SPDIF re-clocker.
However, if you go with one of the high end models (Audio-GD or Denafrips Gaia), it is likely that these would be superior than what you find in a DAC.
All DACs have to take the USB data packets, un-wrap the data and then clock the data at proper timing for the DAC (based on the sampling rate of your audio file - such as 44.1kHz, 48kHz, 96kHz, etc.).
However, if you go with one of the high end models (Audio-GD or Denafrips Gaia), it is likely that these would be superior than what you find in a DAC.
All DACs have to take the USB data packets, un-wrap the data and then clock the data at proper timing for the DAC (based on the sampling rate of your audio file - such as 44.1kHz, 48kHz, 96kHz, etc.).