The Good Ecobee's $249 Ecobee4 Smart Thermostat has a responsive display, a remote sensor and tons of smart integrations, including a built-in Amazon Alexa speaker.
The Bad The price is high, particularly if you don't care about the Alexa speaker or the Ecobee4's other smart capabilities.
The Bottom Line There's no comparison -- the Ecobee4 is the best smart thermostat available today.
The $249 Ecobee4 borrows all of the best stuff from Ecobee's older thermostats. It has a responsive touchscreen display, a remote temperature and proximity sensor, intuitive mobile and web apps and integrations with Amazon Alexa, Apple HomeKit, Samsung SmartThings and IFTTT. But instead of simply working with Alexa, the Ecobee4 itself isan Amazon speaker. (The Ecobee4 is only available in the US; at the current exchange rate, pricing converts to roughly £190/AU$330.)
Not only does the Ecobee4 work incredibly well, it's the smartest thermostat we've ever reviewed. For these reasons, we've given it a CNET Editors' Choice Award. If you don't want all of these smarts (or if you already have an Alexa speaker), consider one of Ecobee's less expensive thermostats or Honeywell's $150 Lyric T5. Otherwise, I'd strongly suggest the Ecobee4.