The most comprehensive ecobee integration is My ecobee device for SmartThings.
I’ve just tested it w/o issues and there are many more features than the ST stock one…
You can even get some comfort & energy savings tips using the Home IQ stats and the indoor/outdoor conditions at your home.
No other ecobee implementation is as resilient and exposes as many features & capabilities.
On top of it, you can enable targeted heating/cooling at your home using my zoning smartapps based on the concepts of rooms/zones/schedules.