Verdict: The Ecobee Smart Thermostat Premium is better for multi-room homes with temperature variation; the Nest Learning Thermostat 4th gen is better for single-zone homes deeply in the Google ecosystem.
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Winner: Ecobee Smart Thermostat Premium
Spec-by-spec comparison
Ecobee Smart Thermostat Premium
Google Nest Learning Thermostat (4th Gen)
Price
$249.99
$279.99
Room Sensors
1 included + $79 ea
None compatible (4th gen)
Apple HomeKit
Yes
No
Google Home
Yes (via Assistant)
Native
Built-In Speaker
Yes (Alexa)
No
Subscription Required
No
No
Ecobee Smart Thermostat Premium
What works
Ships with a room sensor — temperature balancing across rooms out of the box
Apple HomeKit support — works in iOS Home app natively
Cheaper than Nest 4th gen at $249.99
What doesn't
Additional room sensors cost $79 each
Design is functional but less attractive than Nest's circular aesthetic
Alexa microphone always present (can be muted)
Google Nest Learning Thermostat (4th Gen)
What works
Auto-learning from manual adjustments — minimal setup
Cleaner round design that functions as a room accessory
Deep Google Home and Google Assistant integration
What doesn't
No Apple HomeKit support
No room sensor system for multi-zone temperature balancing