I have had both in my system and the Innuos Zen Mk 3 is on a whole other level better than the N100 in every sonic metric.
If you can, try to compare both in your system before deciding as with any new component in the chain, it is all system-dependent.
As for the Sense app, it is wonderful with no issues to date. It is a lot more integrated than the Aurender app.
One big feature in favor of the Zen Mk 3 is that it has a CD slot to convert your music to flac or wav files. But in the end as always, its SQ is way superior to the Aurender's.