Lets break it down nice and simple...

ZC is for people who want a faster engine but don't plan on any extensive mods other than maybe Turbo.

B16A is for people who want an engine they can build up a lot and have a lot of power.

Me personally my 130hp is good enough. I drive it around, its quick, it gets good mileage, its fine. Maybe a turbo some day but I have no plans for that anytime soon.