I've tried close to a hundred various devices, both ZigBee and Z-wave, and I've never had an issue with a Z-wave device but many with ZigBee.
I still use them here and there (mainly Hue bulbs), but I prefer Z-wave whenever possible.
Another factor is ZigBee devices tend to respond much slower. Z-wave light switches are instant on/off when instructed whereas my ZigBee lights always have a delay between 1-4 seconds.