Because it is pretty neutral the Auteur is a solid all rounder. The sub-bass really digs deep so it has no problems with electronic and hip hop, though it isn't particularly bloomy in the mid-bass if you prefer that sound. But the mids are very present and natural so it works well with natural instrument music quite well. I've been listening to all types of genres on it and haven't come across anything that it is weak in. My favorites so far have been alternative, pop, electronic, acoustic, and jazz.
The Atticus is completely different. It is not meant to be neutral, but rather a fun, bassy headphone. It has much more mid-bass warmth and body making it a thicker, heavier sound, whereas the Auteur is much lighter sounding and even. I personally think the Atticus works better as a complementary pair to something like Auteur, Eikon, or HD800, cans that are more reference level neutral. I have only briefly compared Auteur to Eikon at a meet, but the Eikon uses the same drivers as Auteur but is closed back. With that, they have very similar sound signatures (neutral/slight warmth) but the Eikon can have even more sub-bass quantity being closed and there can be a slight unevenness in the upper mids/presence region that can sometimes make the vocals feels a little off. But overall, Eikon is an outstanding closed back headphone, the Auteur basically builds on that being open and widens that sound and refines it while maintaining good technicalities.