Zigbee Lock or Z-wave Lock?

Perhaps another question to ask would be what brand, since reliability often is tied to the manufacturer.

I would recommend Yale or Schlage locks in the US (for Europe there are other options). The are the most reliable over Z-Wave. Kwikset locks z-wave/zigbee modules tend to give trouble after a year or so.

If you want to compare features between locks see this:

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