Seeing these two computers, the Pi Zero has the advantage that is already shipping. The real extra cost is everything you need to be able to use them, such as USB adapter and HDMI adapter, since otherwise the onboard sockets are two small for most standard cables.
At the same time I look at these two computers and wonder how long before they simply simply print out credit-card computers? The main challenge would likely be the things like the video connectors and usb connectors, that would require something to physically soldered on. If they did get this problem sorted, then this could reduce the manufacturing cost dramatically.