I did the research about a year ago and this wasn't an issue that came up. It really just seems to come down to your local market. Zigbee seemed to have more c

I did the research about a year ago and this wasn't an issue that came up. It really just seems to come down to your local market. Zigbee seemed to have more compatible devices in the US vs zwave so I went with zigbee. I only have about fifteen devices, mixed between a few manufacturers, but it's been rock solid after I switched from my initial conbee to a sonoff dongle.