I've been looking into these the last few days as well.
From what I gather
Lyric T5 - Brand new, great price point for a smart thermostat, offers geofencing, integrates with Apple HomeKit, does not offer outside temp/weather
Ecobee3 - Looks good but is still 2 years old (leading people to wonder when ecobee4 is coming out), has all the required and wanted features
Nest - Fanciest, best UI, but does not integrate with Apple HomeKit
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