Initially I was planning to get some 846, partly because there were many Mojo owners posting about great synergy, plus you could also tune the sound by choosing the best filter for your tastes.
However the Beyer AK T8ie caught my eye, and I eventually bought a pair of mk2.
I love the T8s, especially how they handle the fine detail in the mid and treble ranges. They are very tight and precise in the bass range as well, but lack the bass boost that many people prefer.
So they also have great synergy with the mojo, but may not suit everyones preferred sound signature.
Many other owners post about their favourite iems - the mojo has great synergy with quite a few iems, but which is best for you will depend on your preferred sound signature. On the forum, we can suggest a several iems for you to demo, and then select the best for you - there is no iem that is the best for all owners.