I agree with @jhamstead . I like zigbee for many things, particularly battery-operated sensors, but it is subject to interference from Wi-Fi, which zwave is not. Consequently it can be challenging to deploy zigbee devices in fixed location uses like locks and motorized window coverings. Professional installers who have the tools and training to deal with this type of interference can usually find a way to make it work, but it’s not as suitable for DIY implementations.
At my house, we had a problem with boosted Wi-Fi. If we plugged in the Wi-Fi extender on the north wall, we would immediately lose contact with all the zigbee devices west of that. If we just moved the extender to the east wall, everything ran fine.
I also have an ongoing problem with the SmartThings brand arrival sensor, which is nonamplified zigbee. Most weekday afternoons between 330 and 430 or so it just goes bananas and shows itself leaving arriving leaving arriving etcetera. SmartThings support and I worked on it for several months but couldn’t find a resolution. I suspect one of my neighbors has a kid who gets home from school around that time and they have boosted Wi-Fi and it’s affecting the zigbee for the presence sensor.
If you really want a zigbee lock, you can typically get the zigbee module from the lock manufacturer, such as Yale or Kwikset.
In my case, I knew that I would have Wi-Fi cameras near the front door and I wanted to have a strong Wi-Fi signal there. For that reason, I chose a zwave lock.
But the zigbee locks are available, and you can try one and see how it works at your house.