Of the two I found the Mojo to be better sound quality wise for my tastes, well versus an irdac one anyway. The Irdac was warmer sounding and less neutral, but it does have more inputs.
Ultimately however I would say buy neither, and that's from someone who went through a dac phase and who can hear improvements with them provided the system is good enough. Speakers first, and then amps, that's where you'll really hear your money. A good dac can be the fine tuning of a great system, but not the making of one.
The money for either of these has you half way to very decent speaker options that'll significantly improve sound quality more than dacs. Put your cash in a hifi piggy bank.