What DAC is it? There’s no definitive answer to your question. Highly dependent on dac and streamer. USB implementation in both units, quality of DAC clock and jitter rejection properties. If you use spdif you’ll be relying on the clock that’s in your streamer.
Streamer output options
In my younger days, I was told so often that spdif was better than usb that it became doctrine. I'm in the market for a 2k$ish streamer and I see many higher end streamers with usb outputs that pass far higher res data than the spdif 192/24 does. My DAC takes either, but not i2s. Are the new implementations of usb now better than spdif?