I honestly haven't tried those products, but what I don't see is the ability to have remotes control switches (or plug-in lamp modules) without needing to use a controller. Caseta allows this because there is a pairing process that just involves the remote and the switch. I'm not aware of any similar Z-Wave or Zigbee thing, but it would certainly be cool if those existed and honestly would make me reconsider Z-Wave/Zigbee if I was redoing my system.
I only recently (3 months ago) set up my new house with Lutron devices because their diva dimmers are truly the best of anything out there I’ve used - their slide dimmer control is easy to use and their lack of flicker and buzzing with leds is the best out there. Their battery powered remotes also last forever (10 years?) without needing battery changes and work very reliably.
I do have a couple of zwave dimmers for special cases (dimmer and fan in one switch), and they support zwave association. Without the hub being available, one switch can turn on another - you could have the light turn on a fan, for example, or associate a remote control to a light. Zigbee has a similar feature.
