This is what I see in the HomeKit integration:
And this in the native integration:
By far, the most useful difference (at least for me) is the “Ecobee Equipment Running” sensor, which lets me know when it’s running at “Cool1” or “Cool2”, and during the winter, if it’s using the heat pump or the Aux heating.
Also worth noting is I’ve had no issues running both integrations at the same time.