Best Smart Thermostat Option

IMO a smart+standalone thermostat that does not depend on a hub, is more reliable than a zigbee/zwave thermostat connected to any third-party hub.

After my third RadioThermostat failed then I switched to Ecobee. They can be linked to Hubitat and maybe Smartthings, and these thermostats have deep monitoring and management features, IFTTT support etc. If you do not need built-in humidifier/dehumidifier/accessory control then a “-lite” version like “Ecobee 3 lite” can be less than $100, check with your utility for deals.