Another DAC/amp to consider: the iFi micro iDSD Black Label, which is about the same cost as the m9xx and Mojo. With an internal battery and a flat base, it can be used portably and on a desk. It's capable of more power output than the m9xx and Mojo... and has more inputs/outputs.
The iDSD has two 'bonus' features: a 3D+ (crossfeed) switch substantially improves the sound of live recordings; and a USB power-out port to charge your phone's battery, should the need arise.
I would say It depends what you pair it with but i do find it slightly warmer than the Massdrop Centrance dacport slim and the Dacportable. Though warmer, I found the Bl more detailed with power for days.