KNX is the only wired, at least somewhat open system. It’s well-defined and you have a choice of vendors. The only annoying thing (beyond pricing) is the habitude to make money with licensing and certifications only to electrician “experts” (duh!), depriving the public of specifications and documentation, leading to a need to use a proprietary admin software to setup the system.
Then again, you won’t need that any more once you equipped your devices with addresses and OH gets in charge of control.
The remainder of systems on the market, albeit often cheaper, are proprietary. Only interoperable with themselves, so you have to buy everything from that vendor, with all the other risks associated to proprietary systems (lack of bugfixing and support, hidden cost on expansions/upgrades, vendor to abandon products or to go out of business etc etc).
