App compatibility issues has been addressed by Asus using OTA updates. There has been a few ota updates since zenfone has been out in the market. I admire Asus for addressing issues quickly. anyways..
Ask yourself if you love playing around with roms and like to experience vanilla android on your device, if the answer is yes then go with Moto G. Don't expect any aosp roms for zenfone 5 anytime soon. But, I'd still get the zenfone 5. It's a matter of personal preference. Even if we advice you with so many things about the pros and cons of both devices, at the end of the day it is still your money. Just follow your heart. LOL.