I think that the biggest selling point of the yogabook from a practical perspective is that the hinge goes a full 360 degrees, so you can hold it in one hand and operate with the other like a tablet on the go, and put it in tent mode when sharing content with somebody across a table. The ZenBook restricts the hinge to just past 180 degrees, so while it lays (mostly) flat on a table it's unwieldy to use while standing up and can't really point the displays in different directions... but this cut hundreds of dollars off the price and probably increased the lifespan of the machine.
Also the ZenBook keyboard connects physically when you use it like a traditional laptop which removes any possible latency and makes recharging easier, while the yogabook keyboard only functions with a Bluetooth connection and all the problems that can bring.