zigbee is cheaper. It's also standard throughout the world, where as z-wave is regional. So US z-wave doesn't work on europeon, or asian, etc... those don't work on US... So for other countries zigbee is a better fit as it's more standard internationally. I have a mixture of z-wave, zigbee, wifi, and clear connect.
If you haven't read this post, I recommend reading this as you are new user. Will help with some gotchas.
