Couple of things your issue with losing status for zigbee items is that they are expecting constant power to report status (switched on or off) so putting those devices on switched outlets won't work well. This is true for both zwave and zigbee.
I have both zigbee and zwave devices. I find that having both is useful zigbee has a good selection of plug-in outlet devices, sensors(motion temperature ect). There's a really good deal outlet 4 pack sonoff on Amazon. Zwave is great for smart switches basically anything hardwired, switches, dimmers, fan controllers, ect.
Ah yeah these would be 120v sonoff has other Euro spec stuff, I've seen some switches, so there may be a 240v equivalent.
Honestly day to day I couldn't tell you the difference between zwave and zigbee they act as you'd expect and the UI updates status the same. The main difference is the setup and disconnect procedures, which can be even device specific.