Your picture shows a comparison of airflow slots, yeah, but the size of the holes on the deck are what actually matters. And again, I've built on a Zephyrus and hit a Zephyrus, and, at the time, my Billow was much better. A co-worker bought a Zephyrus and had a hard time building on it. So I took it home and threw a build in there. The first thing I noticed was how cramped the build deck was in comparison to my Billow, which is already cramped, and the second thing I noticed was the airflow wasn't as open feeling. But I'm not the only one to feel that way, shortly after he regretted his purchase and eventually sold it. It's kool if you like the Zephyrus, but the tanks we've been referencing are way better than the Billow and the Zeph. The Aromamizer, Crius, Bellus, and MT are leaps and bounds better. I'd rather suggest top notch tanks to the OP.