Does the Paradisea allow you to switch betw. Toslink, RCA and USB inputs? It looks like there's a switch in the back.
The switch on the back toggles the Toslink and RCA. The DAC defaults to USB when a USB cable is inserted.
I'm not familiar with a Denon 2910 so couldn't comment on the comparison. The Paradisea is an excellent DAC to my ears. I've preferred it over a current production Benchmark USB, as well as a Wavelength Brick. I do prefer the output on my Modwright/Sony 999ES.
Marco