

My home has some 100 ZigBee devices… Definitely can recommend ZigBee. Lots of cheap options, specially anything from Sonoff is good quality.
Some devices like thermo/igrometers and smart plugs you can go as cheap as aliexpress allow you…
Some devices like TRVs, smart energy switches I would spend money for a Sonoff or equivalent price point.
You need to invest in pure router devices too, specially in a biggish home. Definitely in multi-stories homes.
And go with an high quality coordinator as well.
You can check my wiki https://wiki.gardiol.org/doku.php?id=homeautomation%3Astart which I wrote mostly for myself for future reference, in the hope it could be useful to others.



In my experience I needed some routers, not smart plugs, to ensure a smooth mesh. Maybe my smart plugs where too cheap. Anyway, I added one router per floor and had no more devices dropping out randomly.
A dedicated router is a small dongle connected to a USB power adapter in a wall outlet. Add to the mesh, and they only provide routing for other devices, no other function.
Maybe you have better quality devices… I have lots of super cheap switches that behave weirdly without.