I haven't seen any post from people who have both Zeus and U12/A12 (yet) or even auditioned both, it's hard to give an advice there although impressions on both sides might help. From your description I'd say A12 would fit the bill (that's from U12 experience so take it with a grain of salt), except maybe for the detailed part depending on what you mean by that. If you like your trebles forward you might not get exactly what you're looking for. Still, there is plenty of details in the treble but in the mids and bass too. That last part is to me a distinctive aspect, I have never heard so many layers in bass. ADEL brings something different here. Separation is amazing and that definitely helps bring out details in a very 3D manner (not only more information, but better positioned information if that makes sense. Layers, layers, layers with great separation). As for expansive soundstage, warm and full sound you wouldn't be disappointed. The soundstage is wide and deep, with very realistic imaging (sometimes eerily so!). Airy and warm is a rare thing and 64 Audio has done marvels in terms of tuning there it does combine both qualities. From what I have read Zeus is on the thicker side, I'd expect less air and more weight, but reading the Zeus reviews and thread would help (I have extensively, as I considered Zeus when I purchased the U12). As for music genres, I feel U12 is a great all rounder, keep in mind that while decently fast it might not be the fastest BA IEM around though (I know I don't mind but some people could).