Quick Question: What is this monitor for? How will it be used?
Fyi there's a lot of bullshit in this subforum, don't believe everything people say especially when its about a monitor they have never seen before. Look at external and credible reviews in addition to people's recommendations. As far as the whole IPS vs VA thing, I find it counterproductive to stereotype them. I'd recommend to look at monitor's individually, paper specs only mean so much and you'll find that even monitors with similar specs can have vastly different irl performance, including stuff like contrast.
The Asus and the BenQ both ue the same panel so they are almost identical in performance. The difference mostly comes in appearence and build quality. In this case I'd prefer the Asus.