.....KNX is too expensive, i need additional wiring, i cannot see any advantages......
One thing that occurs to me is that because KNX is a low voltage dedicated bus (rather than a powerline bus - although KNX does also support powerline and wireless bus signalling) you can put switches in wet areas - bathrooms etc. I supply the KNX power supply via a ups, which will keep the bus system and switches working even if mains power drops (KNX recovers eklegantly from power loss anyway).
Although the switches I use are expensive (relative to other systems) they are very functional. Touch panels with 6 programmable functions per screen and multiple screens (including scenes). It also has a built in thermometer and timers, along with inputs. All this functionality means that one switch can replace many, and integrate heating, lighting, dimming, switching, and shuttering control through one interface.
Of course it's always best to go what works best for you and cost will be a factor in that decision.
Yes, the touch pannels are very functional, but for me they are useless. I plan to manage the whole house with orbiters. With KNX i need an expensive multifunctional touch screen pannel (yes, there are cheaper switches but this is the main advantage of the knx) and a switch/dimmer on every light, and a thermostat unit on radiator. with plcbus i need only a single switchfor every device, whitch is also a receiver and transmitter.
//now i see that PLCbus don't have a feedback from local control. If i understood it correct, if i turn the light on with a local switch, the whole automated system will be not informed about that. Therefore the Z-wave is still in the game. Price is comparable to PLCbus, and if there is a real two-way communication, with feedback to the system if I turn the lights on locally, it is a better choice for an automated home. Also for Z-wave i found thermostats and motion detectors. For PLCbus nothing. I prefer the wired solution, but it looks that i can build a complete home system based on Z-wave, while PLCbus i need additionalsystems for heating and security.