Both Nest and Ecobee are premium units just make sure you get the top of the line Nest and not the eco model if that's what you decide to get.
I've had both and Ecobee is slightly better. Why? Because it has remote temperature sensors, I believe two come with the base unit, that you can place in the distant areas of your home to have a more uniform temperature throughout. You can also put one in your bedroom and program the Ecobee to use that at night to keep your bedroom at the temperature you want when you sleep.
Secondly, the Ecobee has a better user interface and a superior web site where you can control and monitor everything that is happening with the thermostat in your home. Such as, did the heat or A/C come on last night and for how long? The web site has a history showing all that and more and is very easy to access and understand.
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