I prefer to use ZigBee and not have to trust any corporate tech monster, but my smart home aspirations are pretty limited.
(I honestly don't know and was thinking Matter and Thread were somehow related and the were both good and I hope someone can confirm or explain what I am missing.)
https://en.wikipedia.org/wiki/Thread_(network_protocol)
Matter is a network protocol which provides a standard API for how smart devices talk to home hubs. By making devices truly platform agnostic, it will end the dark "Best Viewed With Internet Explorer" direction which smart devices have been going down.