I am using since a while now zigbee (xiaomi and philips) and WiFi (Broadlink, plus other brands, I think all using the ESP8266 chip) and some 433MHz sensors and switches (which I don’t like because of no status signal).
I found the WiFi not reliable enough (at least my few months experience), and I live in a single house, so I have some but little interference from outside WiFi (what happens in an apartment building with 10+ WiFi routers?).
Zigbee is a bit better, problem is I see lot of confusion between different ZigBee protocols, and there are not so many vendors around.
I ordered my first Zwave devices, so I have no direct experience yet.
For my final automation system I would prefer to rely on one system only
I was wondering what the forum has to say on the subject