Zigbee has become ever more popular with users of Home Assistant for several reasons. Zigbee devices can mesh, so every main-powered smart plug or bulb can be a router. The low-power requirements mean that a sensor or input device can run of a single button cell for several years. And finally, Zigbee is generally much cheaper than Z-Wave.
How to build the easiest Zigbee chair occupancy sensor
This DIY Zigbee chair occupancy sensor for Home Assistant doesn't require soldering, knowledge of electronics, or 3D-printing.