Will a USB hub affect the stream?

I have a Marantz HD-DAC1, which I use as my source for my Parasound preamp, which in turn is powered by my PS Audio Stellar S300 amp. My sources are three separate PC's, but the DAC only has one USB input along with two SPDIF inputs. Presently I am using all three but would prefer to use USB for all of the PC's. The question I have of you great folks is will a USB hub be better than using the SPDIF inputs on the Marantz; that is, instead of using the SPDIF inputs, just plugging in the hub into the one USB input? 

Thanks so much,

jonny b