If you’re looking for a Zigbee option, the only controller that didn’t have flickering was the BTF-Lighting LM052 which also had very low idle power consumption and decent sized, easy to use press fit terminals. But the downsides of the LM052 are that it doesn’t have an external button connection, its power on state defaults to on and isn’t configurable, and in Home Assistant you can’t have the white channels on at the same time as the RGB channels when set up as an RGBCCT controller.
