I went for zulus. The ANR failed in a flight and I could not hear any radio calls. Luckily I was not alone. One of the reasons I went for them was that I had read they had better passive reduction than the Bose. If that is technically right, the practical benefit is nothing.
The other reason was price - they were around $300 cheaper. Given the problems (and I have not had good service in getting them repaired - in fact I have had the run around for around 5 months from Lightspeed), I now wish I had bought the Bose. Although I have not used them myself, when I did my research the people who did have them all seemed very happy. Plus I think they may be lighter and have less clamping pressure. Had the zulus not failed I would have been very happy with them, but I will next buy Bose. I hate it when you try to cut costs and then it ends up costing you a whole lot more.